1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_linux
  56 # include "globals_linux.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_solaris
  59 # include "globals_solaris.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_windows
  62 # include "globals_windows.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 179 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 180 define_pd_global(bool, NeverActAsServerClassMachine, true);
 181 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 182 #define CI_COMPILER_COUNT 0
 183 #else
 184 
 185 #ifdef COMPILER2
 186 #define CI_COMPILER_COUNT 2
 187 #else
 188 #define CI_COMPILER_COUNT 1
 189 #endif // COMPILER2
 190 
 191 #endif // no compilers
 192 
 193 // string type aliases used only in this file
 194 typedef const char* ccstr;
 195 typedef const char* ccstrlist;   // represents string arguments which accumulate
 196 
 197 struct Flag {
 198   enum Flags {
 199     // value origin
 200     DEFAULT          = 0,
 201     COMMAND_LINE     = 1,
 202     ENVIRON_VAR      = 2,
 203     CONFIG_FILE      = 3,
 204     MANAGEMENT       = 4,
 205     ERGONOMIC        = 5,
 206     ATTACH_ON_DEMAND = 6,
 207     INTERNAL         = 7,
 208 
 209     LAST_VALUE_ORIGIN = INTERNAL,
 210     VALUE_ORIGIN_BITS = 4,
 211     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 212 
 213     // flag kind
 214     KIND_PRODUCT            = 1 << 4,
 215     KIND_MANAGEABLE         = 1 << 5,
 216     KIND_DIAGNOSTIC         = 1 << 6,
 217     KIND_EXPERIMENTAL       = 1 << 7,
 218     KIND_NOT_PRODUCT        = 1 << 8,
 219     KIND_DEVELOP            = 1 << 9,
 220     KIND_PLATFORM_DEPENDENT = 1 << 10,
 221     KIND_READ_WRITE         = 1 << 11,
 222     KIND_C1                 = 1 << 12,
 223     KIND_C2                 = 1 << 13,
 224     KIND_ARCH               = 1 << 14,
 225     KIND_SHARK              = 1 << 15,
 226     KIND_LP64_PRODUCT       = 1 << 16,
 227     KIND_COMMERCIAL         = 1 << 17,
 228 
 229     KIND_MASK = ~VALUE_ORIGIN_MASK
 230   };
 231 
 232   const char* _type;
 233   const char* _name;
 234   void* _addr;
 235   NOT_PRODUCT(const char* _doc;)
 236   Flags _flags;
 237 
 238   // points to all Flags static array
 239   static Flag* flags;
 240 
 241   // number of flags
 242   static size_t numFlags;
 243 
 244   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
 245   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 246 
 247   void check_writable();
 248 
 249   bool is_bool() const;
 250   bool get_bool() const;
 251   void set_bool(bool value);
 252 
 253   bool is_intx() const;
 254   intx get_intx() const;
 255   void set_intx(intx value);
 256 
 257   bool is_uintx() const;
 258   uintx get_uintx() const;
 259   void set_uintx(uintx value);
 260 
 261   bool is_uint64_t() const;
 262   uint64_t get_uint64_t() const;
 263   void set_uint64_t(uint64_t value);
 264 
 265   bool is_double() const;
 266   double get_double() const;
 267   void set_double(double value);
 268 
 269   bool is_ccstr() const;
 270   bool ccstr_accumulates() const;
 271   ccstr get_ccstr() const;
 272   void set_ccstr(ccstr value);
 273 
 274   Flags get_origin();
 275   void set_origin(Flags origin);
 276 
 277   bool is_default();
 278   bool is_ergonomic();
 279   bool is_command_line();
 280 
 281   bool is_product() const;
 282   bool is_manageable() const;
 283   bool is_diagnostic() const;
 284   bool is_experimental() const;
 285   bool is_notproduct() const;
 286   bool is_develop() const;
 287   bool is_read_write() const;
 288   bool is_commercial() const;
 289 
 290   bool is_constant_in_binary() const;
 291 
 292   bool is_unlocker() const;
 293   bool is_unlocked() const;
 294   bool is_writeable() const;
 295   bool is_external() const;
 296 
 297   bool is_unlocker_ext() const;
 298   bool is_unlocked_ext() const;
 299   bool is_writeable_ext() const;
 300   bool is_external_ext() const;
 301 
 302   void get_locked_message(char*, int) const;
 303   void get_locked_message_ext(char*, int) const;
 304 
 305   void print_on(outputStream* st, bool withComments = false );
 306   void print_kind(outputStream* st);
 307   void print_as_flag(outputStream* st);
 308 };
 309 
 310 // debug flags control various aspects of the VM and are global accessible
 311 
 312 // use FlagSetting to temporarily change some debug flag
 313 // e.g. FlagSetting fs(DebugThisAndThat, true);
 314 // restored to previous value upon leaving scope
 315 class FlagSetting {
 316   bool val;
 317   bool* flag;
 318  public:
 319   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 320   ~FlagSetting()                       { *flag = val; }
 321 };
 322 
 323 
 324 class CounterSetting {
 325   intx* counter;
 326  public:
 327   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 328   ~CounterSetting()         { (*counter)--; }
 329 };
 330 
 331 
 332 class UIntFlagSetting {
 333   uintx val;
 334   uintx* flag;
 335  public:
 336   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 337   ~UIntFlagSetting()                         { *flag = val; }
 338 };
 339 
 340 
 341 class DoubleFlagSetting {
 342   double val;
 343   double* flag;
 344  public:
 345   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 346   ~DoubleFlagSetting()                           { *flag = val; }
 347 };
 348 
 349 
 350 class CommandLineFlags {
 351  public:
 352   static bool boolAt(char* name, size_t len, bool* value);
 353   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 354   static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
 355   static bool boolAtPut(char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 356 
 357   static bool intxAt(char* name, size_t len, intx* value);
 358   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 359   static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
 360   static bool intxAtPut(char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 361 
 362   static bool uintxAt(char* name, size_t len, uintx* value);
 363   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 364   static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
 365   static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 366 
 367   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 368   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 369   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
 370   static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 371 
 372   static bool doubleAt(char* name, size_t len, double* value);
 373   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 374   static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
 375   static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 376 
 377   static bool ccstrAt(char* name, size_t len, ccstr* value);
 378   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 379   static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
 380   static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 381 
 382   // Returns false if name is not a command line flag.
 383   static bool wasSetOnCmdline(const char* name, bool* value);
 384   static void printSetFlags(outputStream* out);
 385 
 386   static void printFlags(outputStream* out, bool withComments);
 387 
 388   static void verify() PRODUCT_RETURN;
 389 };
 390 
 391 // use this for flags that are true by default in the debug version but
 392 // false in the optimized version, and vice versa
 393 #ifdef ASSERT
 394 #define trueInDebug  true
 395 #define falseInDebug false
 396 #else
 397 #define trueInDebug  false
 398 #define falseInDebug true
 399 #endif
 400 
 401 // use this for flags that are true per default in the product build
 402 // but false in development builds, and vice versa
 403 #ifdef PRODUCT
 404 #define trueInProduct  true
 405 #define falseInProduct false
 406 #else
 407 #define trueInProduct  false
 408 #define falseInProduct true
 409 #endif
 410 
 411 #ifdef JAVASE_EMBEDDED
 412 #define falseInEmbedded false
 413 #else
 414 #define falseInEmbedded true
 415 #endif
 416 
 417 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 418 // product flags are always settable / visible
 419 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 420 
 421 // A flag must be declared with one of the following types:
 422 // bool, intx, uintx, ccstr.
 423 // The type "ccstr" is an alias for "const char*" and is used
 424 // only in this file, because the macrology requires single-token type names.
 425 
 426 // Note: Diagnostic options not meant for VM tuning or for product modes.
 427 // They are to be used for VM quality assurance or field diagnosis
 428 // of VM bugs.  They are hidden so that users will not be encouraged to
 429 // try them as if they were VM ordinary execution options.  However, they
 430 // are available in the product version of the VM.  Under instruction
 431 // from support engineers, VM customers can turn them on to collect
 432 // diagnostic information about VM problems.  To use a VM diagnostic
 433 // option, you must first specify +UnlockDiagnosticVMOptions.
 434 // (This master switch also affects the behavior of -Xprintflags.)
 435 //
 436 // experimental flags are in support of features that are not
 437 //    part of the officially supported product, but are available
 438 //    for experimenting with. They could, for example, be performance
 439 //    features that may not have undergone full or rigorous QA, but which may
 440 //    help performance in some cases and released for experimentation
 441 //    by the community of users and developers. This flag also allows one to
 442 //    be able to build a fully supported product that nonetheless also
 443 //    ships with some unsupported, lightly tested, experimental features.
 444 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 445 //    UnlockExperimentalVMOptions flag, which allows the control and
 446 //    modification of the experimental flags.
 447 //
 448 // Nota bene: neither diagnostic nor experimental options should be used casually,
 449 //    and they are not supported on production loads, except under explicit
 450 //    direction from support engineers.
 451 //
 452 // manageable flags are writeable external product flags.
 453 //    They are dynamically writeable through the JDK management interface
 454 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 455 //    These flags are external exported interface (see CCC).  The list of
 456 //    manageable flags can be queried programmatically through the management
 457 //    interface.
 458 //
 459 //    A flag can be made as "manageable" only if
 460 //    - the flag is defined in a CCC as an external exported interface.
 461 //    - the VM implementation supports dynamic setting of the flag.
 462 //      This implies that the VM must *always* query the flag variable
 463 //      and not reuse state related to the flag state at any given time.
 464 //    - you want the flag to be queried programmatically by the customers.
 465 //
 466 // product_rw flags are writeable internal product flags.
 467 //    They are like "manageable" flags but for internal/private use.
 468 //    The list of product_rw flags are internal/private flags which
 469 //    may be changed/removed in a future release.  It can be set
 470 //    through the management interface to get/set value
 471 //    when the name of flag is supplied.
 472 //
 473 //    A flag can be made as "product_rw" only if
 474 //    - the VM implementation supports dynamic setting of the flag.
 475 //      This implies that the VM must *always* query the flag variable
 476 //      and not reuse state related to the flag state at any given time.
 477 //
 478 // Note that when there is a need to support develop flags to be writeable,
 479 // it can be done in the same way as product_rw.
 480 
 481 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 482                                                                             \
 483   lp64_product(bool, UseCompressedOops, false,                              \
 484           "Use 32-bit object references in 64-bit VM. "                     \
 485           "lp64_product means flag is always constant in 32 bit VM")        \
 486                                                                             \
 487   lp64_product(bool, UseCompressedClassPointers, false,                     \
 488           "Use 32-bit class pointers in 64-bit VM. "                        \
 489           "lp64_product means flag is always constant in 32 bit VM")        \
 490                                                                             \
 491   notproduct(bool, CheckCompressedOops, true,                               \
 492           "Generate checks in encoding/decoding code in debug VM")          \
 493                                                                             \
 494   product_pd(uintx, HeapBaseMinAddress,                                     \
 495           "OS specific low limit for heap base address")                    \
 496                                                                             \
 497   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 498           "Print compressed oops base address and encoding mode")           \
 499                                                                             \
 500   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 501           "Default object alignment in bytes, 8 is minimum")                \
 502                                                                             \
 503   product(bool, AssumeMP, false,                                            \
 504           "Instruct the VM to assume multiple processors are available")    \
 505                                                                             \
 506   /* UseMembar is theoretically a temp flag used for memory barrier         \
 507    * removal testing.  It was supposed to be removed before FCS but has     \
 508    * been re-added (see 6401008) */                                         \
 509   product_pd(bool, UseMembar,                                               \
 510           "(Unstable) Issues membars on thread state transitions")          \
 511                                                                             \
 512   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 513    * that don't support it.  This will be replaced by processor detection   \
 514    * logic.                                                                 \
 515    */                                                                       \
 516   product(bool, UsePPCLWSYNC, true,                                         \
 517           "Use lwsync instruction if true, else use slower sync")           \
 518                                                                             \
 519   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 520           "Clean the chunk pool asynchronously")                            \
 521                                                                             \
 522   /* Temporary: See 6948537 */                                              \
 523   experimental(bool, UseMemSetInBOT, true,                                  \
 524           "(Unstable) uses memset in BOT updates in GC code")               \
 525                                                                             \
 526   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 527           "Enable normal processing of flags relating to field diagnostics")\
 528                                                                             \
 529   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 530           "Enable normal processing of flags relating to experimental "     \
 531           "features")                                                       \
 532                                                                             \
 533   product(bool, JavaMonitorsInStackTrace, true,                             \
 534           "Print information about Java monitor locks when the stacks are"  \
 535           "dumped")                                                         \
 536                                                                             \
 537   product_pd(bool, UseLargePages,                                           \
 538           "Use large page memory")                                          \
 539                                                                             \
 540   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 541           "Allocate large pages individually for better affinity")          \
 542                                                                             \
 543   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 544           "Fail large pages individual allocation")                         \
 545                                                                             \
 546   product(bool, UseLargePagesInMetaspace, false,                            \
 547           "Use large page memory in metaspace. "                            \
 548           "Only used if UseLargePages is enabled.")                         \
 549                                                                             \
 550   develop(bool, TracePageSizes, false,                                      \
 551           "Trace page size selection and usage")                            \
 552                                                                             \
 553   product(bool, UseNUMA, false,                                             \
 554           "Use NUMA if available")                                          \
 555                                                                             \
 556   product(bool, UseNUMAInterleaving, false,                                 \
 557           "Interleave memory across NUMA nodes if available")               \
 558                                                                             \
 559   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 560           "Granularity to use for NUMA interleaving on Windows OS")         \
 561                                                                             \
 562   product(bool, ForceNUMA, false,                                           \
 563           "Force NUMA optimizations on single-node/UMA systems")            \
 564                                                                             \
 565   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 566           "Percentage (0-100) used to weigh the current sample when "       \
 567           "computing exponentially decaying average for "                   \
 568           "AdaptiveNUMAChunkSizing")                                        \
 569                                                                             \
 570   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 571           "Do not reallocate more than this amount per collection")         \
 572                                                                             \
 573   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 574           "Enable adaptive chunk sizing for NUMA")                          \
 575                                                                             \
 576   product(bool, NUMAStats, false,                                           \
 577           "Print NUMA stats in detailed heap information")                  \
 578                                                                             \
 579   product(uintx, NUMAPageScanRate, 256,                                     \
 580           "Maximum number of pages to include in the page scan procedure")  \
 581                                                                             \
 582   product_pd(bool, NeedsDeoptSuspend,                                       \
 583           "True for register window machines (sparc/ia64)")                 \
 584                                                                             \
 585   product(intx, UseSSE, 99,                                                 \
 586           "Highest supported SSE instructions set on x86/x64")              \
 587                                                                             \
 588   product(bool, UseAES, false,                                              \
 589           "Control whether AES instructions can be used on x86/x64")        \
 590                                                                             \
 591   product(uintx, LargePageSizeInBytes, 0,                                   \
 592           "Large page size (0 to let VM choose the page size)")             \
 593                                                                             \
 594   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 595           "Use large pages if maximum heap is at least this big")           \
 596                                                                             \
 597   product(bool, ForceTimeHighResolution, false,                             \
 598           "Using high time resolution (for Win32 only)")                    \
 599                                                                             \
 600   develop(bool, TraceItables, false,                                        \
 601           "Trace initialization and use of itables")                        \
 602                                                                             \
 603   develop(bool, TracePcPatching, false,                                     \
 604           "Trace usage of frame::patch_pc")                                 \
 605                                                                             \
 606   develop(bool, TraceJumps, false,                                          \
 607           "Trace assembly jumps in thread ring buffer")                     \
 608                                                                             \
 609   develop(bool, TraceRelocator, false,                                      \
 610           "Trace the bytecode relocator")                                   \
 611                                                                             \
 612   develop(bool, TraceLongCompiles, false,                                   \
 613           "Print out every time compilation is longer than "                \
 614           "a given threshold")                                              \
 615                                                                             \
 616   develop(bool, SafepointALot, false,                                       \
 617           "Generate a lot of safepoints. This works with "                  \
 618           "GuaranteedSafepointInterval")                                    \
 619                                                                             \
 620   product_pd(bool, BackgroundCompilation,                                   \
 621           "A thread requesting compilation is not blocked during "          \
 622           "compilation")                                                    \
 623                                                                             \
 624   product(bool, PrintVMQWaitTime, false,                                    \
 625           "Print out the waiting time in VM operation queue")               \
 626                                                                             \
 627   develop(bool, NoYieldsInMicrolock, false,                                 \
 628           "Disable yields in microlock")                                    \
 629                                                                             \
 630   develop(bool, TraceOopMapGeneration, false,                               \
 631           "Show OopMapGeneration")                                          \
 632                                                                             \
 633   product(bool, MethodFlushing, true,                                       \
 634           "Reclamation of zombie and not-entrant methods")                  \
 635                                                                             \
 636   develop(bool, VerifyStack, false,                                         \
 637           "Verify stack of each thread when it is entering a runtime call") \
 638                                                                             \
 639   diagnostic(bool, ForceUnreachable, false,                                 \
 640           "Make all non code cache addresses to be unreachable by "         \
 641           "forcing use of 64bit literal fixups")                            \
 642                                                                             \
 643   notproduct(bool, StressDerivedPointers, false,                            \
 644           "Force scavenge when a derived pointer is detected on stack "     \
 645           "after rtm call")                                                 \
 646                                                                             \
 647   develop(bool, TraceDerivedPointers, false,                                \
 648           "Trace traversal of derived pointers on stack")                   \
 649                                                                             \
 650   notproduct(bool, TraceCodeBlobStacks, false,                              \
 651           "Trace stack-walk of codeblobs")                                  \
 652                                                                             \
 653   product(bool, PrintJNIResolving, false,                                   \
 654           "Used to implement -v:jni")                                       \
 655                                                                             \
 656   notproduct(bool, PrintRewrites, false,                                    \
 657           "Print methods that are being rewritten")                         \
 658                                                                             \
 659   product(bool, UseInlineCaches, true,                                      \
 660           "Use Inline Caches for virtual calls ")                           \
 661                                                                             \
 662   develop(bool, InlineArrayCopy, true,                                      \
 663           "Inline arraycopy native that is known to be part of "            \
 664           "base library DLL")                                               \
 665                                                                             \
 666   develop(bool, InlineObjectHash, true,                                     \
 667           "Inline Object::hashCode() native that is known to be part "      \
 668           "of base library DLL")                                            \
 669                                                                             \
 670   develop(bool, InlineNatives, true,                                        \
 671           "Inline natives that are known to be part of base library DLL")   \
 672                                                                             \
 673   develop(bool, InlineMathNatives, true,                                    \
 674           "Inline SinD, CosD, etc.")                                        \
 675                                                                             \
 676   develop(bool, InlineClassNatives, true,                                   \
 677           "Inline Class.isInstance, etc")                                   \
 678                                                                             \
 679   develop(bool, InlineThreadNatives, true,                                  \
 680           "Inline Thread.currentThread, etc")                               \
 681                                                                             \
 682   develop(bool, InlineUnsafeOps, true,                                      \
 683           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 684                                                                             \
 685   product(bool, CriticalJNINatives, true,                                   \
 686           "Check for critical JNI entry points")                            \
 687                                                                             \
 688   notproduct(bool, StressCriticalJNINatives, false,                         \
 689           "Exercise register saving code in critical natives")              \
 690                                                                             \
 691   product(bool, UseSSE42Intrinsics, false,                                  \
 692           "SSE4.2 versions of intrinsics")                                  \
 693                                                                             \
 694   product(bool, UseAESIntrinsics, false,                                    \
 695           "Use intrinsics for AES versions of crypto")                      \
 696                                                                             \
 697   product(bool, UseCRC32Intrinsics, false,                                  \
 698           "use intrinsics for java.util.zip.CRC32")                         \
 699                                                                             \
 700   develop(bool, TraceCallFixup, false,                                      \
 701           "Trace all call fixups")                                          \
 702                                                                             \
 703   develop(bool, DeoptimizeALot, false,                                      \
 704           "Deoptimize at every exit from the runtime system")               \
 705                                                                             \
 706   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 707           "A comma separated list of bcis to deoptimize at")                \
 708                                                                             \
 709   product(bool, DeoptimizeRandom, false,                                    \
 710           "Deoptimize random frames on random exit from the runtime system")\
 711                                                                             \
 712   notproduct(bool, ZombieALot, false,                                       \
 713           "Create zombies (non-entrant) at exit from the runtime system")   \
 714                                                                             \
 715   product(bool, UnlinkSymbolsALot, false,                                   \
 716           "Unlink unreferenced symbols from the symbol table at safepoints")\
 717                                                                             \
 718   notproduct(bool, WalkStackALot, false,                                    \
 719           "Trace stack (no print) at every exit from the runtime system")   \
 720                                                                             \
 721   product(bool, Debugging, false,                                           \
 722           "Set when executing debug methods in debug.cpp "                  \
 723           "(to prevent triggering assertions)")                             \
 724                                                                             \
 725   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 726           "Enable strict checks that safepoints cannot happen for threads " \
 727           "that use No_Safepoint_Verifier")                                 \
 728                                                                             \
 729   notproduct(bool, VerifyLastFrame, false,                                  \
 730           "Verify oops on last frame on entry to VM")                       \
 731                                                                             \
 732   develop(bool, TraceHandleAllocation, false,                               \
 733           "Print out warnings when suspiciously many handles are allocated")\
 734                                                                             \
 735   product(bool, UseCompilerSafepoints, true,                                \
 736           "Stop at safepoints in compiled code")                            \
 737                                                                             \
 738   product(bool, FailOverToOldVerifier, true,                                \
 739           "Fail over to old verifier when split verifier fails")            \
 740                                                                             \
 741   develop(bool, ShowSafepointMsgs, false,                                   \
 742           "Show message about safepoint synchronization")                   \
 743                                                                             \
 744   product(bool, SafepointTimeout, false,                                    \
 745           "Time out and warn or fail after SafepointTimeoutDelay "          \
 746           "milliseconds if failed to reach safepoint")                      \
 747                                                                             \
 748   develop(bool, DieOnSafepointTimeout, false,                               \
 749           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 750                                                                             \
 751   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 752   /* typically, at most a few retries are needed */                         \
 753   product(intx, SuspendRetryCount, 50,                                      \
 754           "Maximum retry count for an external suspend request")            \
 755                                                                             \
 756   product(intx, SuspendRetryDelay, 5,                                       \
 757           "Milliseconds to delay per retry (* current_retry_count)")        \
 758                                                                             \
 759   product(bool, AssertOnSuspendWaitFailure, false,                          \
 760           "Assert/Guarantee on external suspend wait failure")              \
 761                                                                             \
 762   product(bool, TraceSuspendWaitFailures, false,                            \
 763           "Trace external suspend wait failures")                           \
 764                                                                             \
 765   product(bool, MaxFDLimit, true,                                           \
 766           "Bump the number of file descriptors to maximum in Solaris")      \
 767                                                                             \
 768   diagnostic(bool, LogEvents, true,                                         \
 769           "Enable the various ring buffer event logs")                      \
 770                                                                             \
 771   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 772           "Number of ring buffer event logs")                               \
 773                                                                             \
 774   product(bool, BytecodeVerificationRemote, true,                           \
 775           "Enable the Java bytecode verifier for remote classes")           \
 776                                                                             \
 777   product(bool, BytecodeVerificationLocal, false,                           \
 778           "Enable the Java bytecode verifier for local classes")            \
 779                                                                             \
 780   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 781           "Force exceptions on FP stack under/overflow")                    \
 782                                                                             \
 783   develop(bool, VerifyStackAtCalls, false,                                  \
 784           "Verify that the stack pointer is unchanged after calls")         \
 785                                                                             \
 786   develop(bool, TraceJavaAssertions, false,                                 \
 787           "Trace java language assertions")                                 \
 788                                                                             \
 789   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 790           "Temporary - see javaClasses.cpp")                                \
 791                                                                             \
 792   notproduct(bool, PrintMallocFree, false,                                  \
 793           "Trace calls to C heap malloc/free allocation")                   \
 794                                                                             \
 795   product(bool, PrintOopAddress, false,                                     \
 796           "Always print the location of the oop")                           \
 797                                                                             \
 798   notproduct(bool, VerifyCodeCacheOften, false,                             \
 799           "Verify compiled-code cache often")                               \
 800                                                                             \
 801   develop(bool, ZapDeadCompiledLocals, false,                               \
 802           "Zap dead locals in compiler frames")                             \
 803                                                                             \
 804   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 805           "Zap dead locals (old version, zaps all frames when "             \
 806           "entering the VM")                                                \
 807                                                                             \
 808   notproduct(bool, CheckOopishValues, false,                                \
 809           "Warn if value contains oop (requires ZapDeadLocals)")            \
 810                                                                             \
 811   develop(bool, UseMallocOnly, false,                                       \
 812           "Use only malloc/free for allocation (no resource area/arena)")   \
 813                                                                             \
 814   develop(bool, PrintMalloc, false,                                         \
 815           "Print all malloc/free calls")                                    \
 816                                                                             \
 817   develop(bool, PrintMallocStatistics, false,                               \
 818           "Print malloc/free statistics")                                   \
 819                                                                             \
 820   develop(bool, ZapResourceArea, trueInDebug,                               \
 821           "Zap freed resource/arena space with 0xABABABAB")                 \
 822                                                                             \
 823   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 824           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 825                                                                             \
 826   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 827           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 828                                                                             \
 829   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 830           "Zap allocated/freed stack segments with 0xFADFADED")             \
 831                                                                             \
 832   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 833           "Zap unused heap space with 0xBAADBABE")                          \
 834                                                                             \
 835   develop(bool, TraceZapUnusedHeapArea, false,                              \
 836           "Trace zapping of unused heap space")                             \
 837                                                                             \
 838   develop(bool, CheckZapUnusedHeapArea, false,                              \
 839           "Check zapping of unused heap space")                             \
 840                                                                             \
 841   develop(bool, ZapFillerObjects, trueInDebug,                              \
 842           "Zap filler objects with 0xDEAFBABE")                             \
 843                                                                             \
 844   develop(bool, PrintVMMessages, true,                                      \
 845           "Print VM messages on console")                                   \
 846                                                                             \
 847   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 848           "Print the time the application has been running")                \
 849                                                                             \
 850   product(bool, PrintGCApplicationStoppedTime, false,                       \
 851           "Print the time the application has been stopped")                \
 852                                                                             \
 853   diagnostic(bool, VerboseVerification, false,                              \
 854           "Display detailed verification details")                          \
 855                                                                             \
 856   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 857           "If > 0, provokes an error after VM initialization; the value "   \
 858           "determines which error to provoke. See test_error_handler() "    \
 859           "in debug.cpp.")                                                  \
 860                                                                             \
 861   develop(bool, Verbose, false,                                             \
 862           "Print additional debugging information from other modes")        \
 863                                                                             \
 864   develop(bool, PrintMiscellaneous, false,                                  \
 865           "Print uncategorized debugging information (requires +Verbose)")  \
 866                                                                             \
 867   develop(bool, WizardMode, false,                                          \
 868           "Print much more debugging information")                          \
 869                                                                             \
 870   product(bool, ShowMessageBoxOnError, false,                               \
 871           "Keep process alive on VM fatal error")                           \
 872                                                                             \
 873   product(bool, CreateMinidumpOnCrash, false,                               \
 874           "Create minidump on VM fatal error")                              \
 875                                                                             \
 876   product_pd(bool, UseOSErrorReporting,                                     \
 877           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 878                                                                             \
 879   product(bool, SuppressFatalErrorMessage, false,                           \
 880           "Report NO fatal error message (avoid deadlock)")                 \
 881                                                                             \
 882   product(ccstrlist, OnError, "",                                           \
 883           "Run user-defined commands on fatal error; see VMError.cpp "      \
 884           "for examples")                                                   \
 885                                                                             \
 886   product(ccstrlist, OnOutOfMemoryError, "",                                \
 887           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 888                                                                             \
 889   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 890           "Dump heap to file before any major stop-the-world GC")           \
 891                                                                             \
 892   manageable(bool, HeapDumpAfterFullGC, false,                              \
 893           "Dump heap to file after any major stop-the-world GC")            \
 894                                                                             \
 895   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 896           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 897                                                                             \
 898   manageable(ccstr, HeapDumpPath, NULL,                                     \
 899           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 900           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 901           "in the working directory)")                                      \
 902                                                                             \
 903   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 904           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 905           "when the heap usage is larger than this")                        \
 906                                                                             \
 907   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 908           "Approximate segment size when generating a segmented heap dump") \
 909                                                                             \
 910   develop(bool, BreakAtWarning, false,                                      \
 911           "Execute breakpoint upon encountering VM warning")                \
 912                                                                             \
 913   develop(bool, TraceVMOperation, false,                                    \
 914           "Trace VM operations")                                            \
 915                                                                             \
 916   develop(bool, UseFakeTimers, false,                                       \
 917           "Tell whether the VM should use system time or a fake timer")     \
 918                                                                             \
 919   product(ccstr, NativeMemoryTracking, "off",                               \
 920           "Native memory tracking options")                                 \
 921                                                                             \
 922   diagnostic(bool, PrintNMTStatistics, false,                               \
 923           "Print native memory tracking summary data if it is on")          \
 924                                                                             \
 925   diagnostic(bool, AutoShutdownNMT, true,                                   \
 926           "Automatically shutdown native memory tracking under stress "     \
 927           "situations. When set to false, native memory tracking tries to " \
 928           "stay alive at the expense of JVM performance")                   \
 929                                                                             \
 930   diagnostic(bool, LogCompilation, false,                                   \
 931           "Log compilation activity in detail to LogFile")                  \
 932                                                                             \
 933   product(bool, PrintCompilation, false,                                    \
 934           "Print compilations")                                             \
 935                                                                             \
 936   diagnostic(bool, TraceNMethodInstalls, false,                             \
 937           "Trace nmethod installation")                                     \
 938                                                                             \
 939   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 940           "0: do not allow scavengable oops in the code cache; "            \
 941           "1: allow scavenging from the code cache; "                       \
 942           "2: emit as many constants as the compiler can see")              \
 943                                                                             \
 944   product(bool, AlwaysRestoreFPU, false,                                    \
 945           "Restore the FPU control word after every JNI call (expensive)")  \
 946                                                                             \
 947   diagnostic(bool, PrintCompilation2, false,                                \
 948           "Print additional statistics per compilation")                    \
 949                                                                             \
 950   diagnostic(bool, PrintAdapterHandlers, false,                             \
 951           "Print code generated for i2c/c2i adapters")                      \
 952                                                                             \
 953   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 954           "Verify that i2c/c2i adapters are called properly")               \
 955                                                                             \
 956   develop(bool, VerifyAdapterSharing, false,                                \
 957           "Verify that the code for shared adapters is the equivalent")     \
 958                                                                             \
 959   diagnostic(bool, PrintAssembly, false,                                    \
 960           "Print assembly code (using external disassembler.so)")           \
 961                                                                             \
 962   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 963           "Print options string passed to disassembler.so")                 \
 964                                                                             \
 965   diagnostic(bool, PrintNMethods, false,                                    \
 966           "Print assembly code for nmethods when generated")                \
 967                                                                             \
 968   diagnostic(bool, PrintNativeNMethods, false,                              \
 969           "Print assembly code for native nmethods when generated")         \
 970                                                                             \
 971   develop(bool, PrintDebugInfo, false,                                      \
 972           "Print debug information for all nmethods when generated")        \
 973                                                                             \
 974   develop(bool, PrintRelocations, false,                                    \
 975           "Print relocation information for all nmethods when generated")   \
 976                                                                             \
 977   develop(bool, PrintDependencies, false,                                   \
 978           "Print dependency information for all nmethods when generated")   \
 979                                                                             \
 980   develop(bool, PrintExceptionHandlers, false,                              \
 981           "Print exception handler tables for all nmethods when generated") \
 982                                                                             \
 983   develop(bool, StressCompiledExceptionHandlers, false,                     \
 984           "Exercise compiled exception handlers")                           \
 985                                                                             \
 986   develop(bool, InterceptOSException, false,                                \
 987           "Start debugger when an implicit OS (e.g. NULL) "                 \
 988           "exception happens")                                              \
 989                                                                             \
 990   product(bool, PrintCodeCache, false,                                      \
 991           "Print the code cache memory usage when exiting")                 \
 992                                                                             \
 993   develop(bool, PrintCodeCache2, false,                                     \
 994           "Print detailed usage information on the code cache when exiting")\
 995                                                                             \
 996   product(bool, PrintCodeCacheOnCompilation, false,                         \
 997           "Print the code cache memory usage each time a method is "        \
 998           "compiled")                                                       \
 999                                                                             \
1000   diagnostic(bool, PrintStubCode, false,                                    \
1001           "Print generated stub code")                                      \
1002                                                                             \
1003   product(bool, StackTraceInThrowable, true,                                \
1004           "Collect backtrace in throwable when exception happens")          \
1005                                                                             \
1006   product(bool, OmitStackTraceInFastThrow, true,                            \
1007           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1008                                                                             \
1009   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1010           "Print bytecode statistics when dumping profiler output")         \
1011                                                                             \
1012   product(bool, ProfilerRecordPC, false,                                    \
1013           "Collect ticks for each 16 byte interval of compiled code")       \
1014                                                                             \
1015   product(bool, ProfileVM, false,                                           \
1016           "Profile ticks that fall within VM (either in the VM Thread "     \
1017           "or VM code called through stubs)")                               \
1018                                                                             \
1019   product(bool, ProfileIntervals, false,                                    \
1020           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1021                                                                             \
1022   notproduct(bool, ProfilerCheckIntervals, false,                           \
1023           "Collect and print information on spacing of profiler ticks")     \
1024                                                                             \
1025   develop(bool, PrintJVMWarnings, false,                                    \
1026           "Print warnings for unimplemented JVM functions")                 \
1027                                                                             \
1028   product(bool, PrintWarnings, true,                                        \
1029           "Print JVM warnings to output stream")                            \
1030                                                                             \
1031   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1032           "Print warnings for stalled SpinLocks")                           \
1033                                                                             \
1034   product(bool, RegisterFinalizersAtInit, true,                             \
1035           "Register finalizable objects at end of Object.<init> or "        \
1036           "after allocation")                                               \
1037                                                                             \
1038   develop(bool, RegisterReferences, true,                                   \
1039           "Tell whether the VM should register soft/weak/final/phantom "    \
1040           "references")                                                     \
1041                                                                             \
1042   develop(bool, IgnoreRewrites, false,                                      \
1043           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1044           "This is unsafe!")                                                \
1045                                                                             \
1046   develop(bool, PrintCodeCacheExtension, false,                             \
1047           "Print extension of code cache")                                  \
1048                                                                             \
1049   develop(bool, UsePrivilegedStack, true,                                   \
1050           "Enable the security JVM functions")                              \
1051                                                                             \
1052   develop(bool, ProtectionDomainVerification, true,                         \
1053           "Verify protection domain before resolution in system dictionary")\
1054                                                                             \
1055   product(bool, ClassUnloading, true,                                       \
1056           "Do unloading of classes")                                        \
1057                                                                             \
1058   develop(bool, DisableStartThread, false,                                  \
1059           "Disable starting of additional Java threads "                    \
1060           "(for debugging only)")                                           \
1061                                                                             \
1062   develop(bool, MemProfiling, false,                                        \
1063           "Write memory usage profiling to log file")                       \
1064                                                                             \
1065   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1066           "Print the system dictionary at exit")                            \
1067                                                                             \
1068   experimental(intx, PredictedLoadedClassCount, 0,                          \
1069           "Experimental: Tune loaded class cache starting size")            \
1070                                                                             \
1071   diagnostic(bool, UnsyncloadClass, false,                                  \
1072           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1073           "class loader must call VM synchronized for findClass "           \
1074           "and defineClass.")                                               \
1075                                                                             \
1076   product(bool, AlwaysLockClassLoader, false,                               \
1077           "Require the VM to acquire the class loader lock before calling " \
1078           "loadClass() even for class loaders registering "                 \
1079           "as parallel capable")                                            \
1080                                                                             \
1081   product(bool, AllowParallelDefineClass, false,                            \
1082           "Allow parallel defineClass requests for class loaders "          \
1083           "registering as parallel capable")                                \
1084                                                                             \
1085   product(bool, MustCallLoadClassInternal, false,                           \
1086           "Call loadClassInternal() rather than loadClass()")               \
1087                                                                             \
1088   product_pd(bool, DontYieldALot,                                           \
1089           "Throw away obvious excess yield calls (for Solaris only)")       \
1090                                                                             \
1091   product_pd(bool, ConvertSleepToYield,                                     \
1092           "Convert sleep(0) to thread yield "                               \
1093           "(may be off for Solaris to improve GUI)")                        \
1094                                                                             \
1095   product(bool, ConvertYieldToSleep, false,                                 \
1096           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1097           "behavior (Solaris only)")                                        \
1098                                                                             \
1099   product(bool, UseBoundThreads, true,                                      \
1100           "Bind user level threads to kernel threads (for Solaris only)")   \
1101                                                                             \
1102   develop(bool, UseDetachedThreads, true,                                   \
1103           "Use detached threads that are recycled upon termination "        \
1104           "(for Solaris only)")                                             \
1105                                                                             \
1106   product(bool, UseLWPSynchronization, true,                                \
1107           "Use LWP-based instead of libthread-based synchronization "       \
1108           "(SPARC only)")                                                   \
1109                                                                             \
1110   product(ccstr, SyncKnobs, NULL,                                           \
1111           "(Unstable) Various monitor synchronization tunables")            \
1112                                                                             \
1113   product(intx, EmitSync, 0,                                                \
1114           "(Unsafe, Unstable) "                                             \
1115           "Control emission of inline sync fast-path code")                 \
1116                                                                             \
1117   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1118                                                                             \
1119   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1120                                                                             \
1121   product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1122                                                                             \
1123   product(intx, SyncVerbose, 0, "(Unstable)")                               \
1124                                                                             \
1125   product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")                    \
1126                                                                             \
1127   product(intx, hashCode, 5,                                                \
1128           "(Unstable) select hashCode generation algorithm")                \
1129                                                                             \
1130   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1131           "(Unstable, Linux-specific) "                                     \
1132           "avoid NPTL-FUTEX hang pthread_cond_timedwait")                   \
1133                                                                             \
1134   product(bool, FilterSpuriousWakeups, true,                                \
1135           "Prevent spurious or premature wakeups from object.wait "         \
1136           "(Solaris only)")                                                 \
1137                                                                             \
1138   product(intx, NativeMonitorTimeout, -1, "(Unstable)")                     \
1139                                                                             \
1140   product(intx, NativeMonitorFlags, 0, "(Unstable)")                        \
1141                                                                             \
1142   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)")                   \
1143                                                                             \
1144   develop(bool, UsePthreads, false,                                         \
1145           "Use pthread-based instead of libthread-based synchronization "   \
1146           "(SPARC only)")                                                   \
1147                                                                             \
1148   product(bool, AdjustConcurrency, false,                                   \
1149           "Call thr_setconcurrency at thread creation time to avoid "       \
1150           "LWP starvation on MP systems (for Solaris Only)")                \
1151                                                                             \
1152   product(bool, ReduceSignalUsage, false,                                   \
1153           "Reduce the use of OS signals in Java and/or the VM")             \
1154                                                                             \
1155   develop_pd(bool, ShareVtableStubs,                                        \
1156           "Share vtable stubs (smaller code but worse branch prediction")   \
1157                                                                             \
1158   develop(bool, LoadLineNumberTables, true,                                 \
1159           "Tell whether the class file parser loads line number tables")    \
1160                                                                             \
1161   develop(bool, LoadLocalVariableTables, true,                              \
1162           "Tell whether the class file parser loads local variable tables") \
1163                                                                             \
1164   develop(bool, LoadLocalVariableTypeTables, true,                          \
1165           "Tell whether the class file parser loads local variable type"    \
1166           "tables")                                                         \
1167                                                                             \
1168   product(bool, AllowUserSignalHandlers, false,                             \
1169           "Do not complain if the application installs signal handlers "    \
1170           "(Solaris & Linux only)")                                         \
1171                                                                             \
1172   product(bool, UseSignalChaining, true,                                    \
1173           "Use signal-chaining to invoke signal handlers installed "        \
1174           "by the application (Solaris & Linux only)")                      \
1175                                                                             \
1176   product(bool, UseAltSigs, false,                                          \
1177           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1178           "internal signals (Solaris only)")                                \
1179                                                                             \
1180   product(bool, AllowJNIEnvProxy, false,                                    \
1181           "Allow JNIEnv proxies for jdbx")                                  \
1182                                                                             \
1183   product(bool, JNIDetachReleasesMonitors, true,                            \
1184           "JNI DetachCurrentThread releases monitors owned by thread")      \
1185                                                                             \
1186   product(bool, RestoreMXCSROnJNICalls, false,                              \
1187           "Restore MXCSR when returning from JNI calls")                    \
1188                                                                             \
1189   product(bool, CheckJNICalls, false,                                       \
1190           "Verify all arguments to JNI calls")                              \
1191                                                                             \
1192   product(bool, UseFastJNIAccessors, true,                                  \
1193           "Use optimized versions of Get<Primitive>Field")                  \
1194                                                                             \
1195   product(bool, EagerXrunInit, false,                                       \
1196           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1197           "but not all -Xrun libraries may support the state of the VM "    \
1198           "at this time")                                                   \
1199                                                                             \
1200   product(bool, PreserveAllAnnotations, false,                              \
1201           "Preserve RuntimeInvisibleAnnotations as well "                   \
1202           "as RuntimeVisibleAnnotations")                                   \
1203                                                                             \
1204   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1205           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1206                                                                             \
1207   product(bool, LazyBootClassLoader, true,                                  \
1208           "Enable/disable lazy opening of boot class path entries")         \
1209                                                                             \
1210   product(bool, UseXMMForArrayCopy, false,                                  \
1211           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1212                                                                             \
1213   product(intx, FieldsAllocationStyle, 1,                                   \
1214           "0 - type based with oops first, 1 - with oops last, "            \
1215           "2 - oops in super and sub classes are together")                 \
1216                                                                             \
1217   product(bool, CompactFields, true,                                        \
1218           "Allocate nonstatic fields in gaps between previous fields")      \
1219                                                                             \
1220   notproduct(bool, PrintFieldLayout, false,                                 \
1221           "Print field layout for each class")                              \
1222                                                                             \
1223   product(intx, ContendedPaddingWidth, 128,                                 \
1224           "How many bytes to pad the fields/classes marked @Contended with")\
1225                                                                             \
1226   product(bool, EnableContended, true,                                      \
1227           "Enable @Contended annotation support")                           \
1228                                                                             \
1229   product(bool, RestrictContended, true,                                    \
1230           "Restrict @Contended to trusted classes")                         \
1231                                                                             \
1232   product(bool, UseBiasedLocking, true,                                     \
1233           "Enable biased locking in JVM")                                   \
1234                                                                             \
1235   product(intx, BiasedLockingStartupDelay, 4000,                            \
1236           "Number of milliseconds to wait before enabling biased locking")  \
1237                                                                             \
1238   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1239           "Print statistics of biased locking in JVM")                      \
1240                                                                             \
1241   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1242           "Threshold of number of revocations per type to try to "          \
1243           "rebias all objects in the heap of that type")                    \
1244                                                                             \
1245   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1246           "Threshold of number of revocations per type to permanently "     \
1247           "revoke biases of all objects in the heap of that type")          \
1248                                                                             \
1249   product(intx, BiasedLockingDecayTime, 25000,                              \
1250           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1251           "type after previous bulk rebias")                                \
1252                                                                             \
1253   /* tracing */                                                             \
1254                                                                             \
1255   notproduct(bool, TraceRuntimeCalls, false,                                \
1256           "Trace run-time calls")                                           \
1257                                                                             \
1258   develop(bool, TraceJNICalls, false,                                       \
1259           "Trace JNI calls")                                                \
1260                                                                             \
1261   notproduct(bool, TraceJVMCalls, false,                                    \
1262           "Trace JVM calls")                                                \
1263                                                                             \
1264   product(ccstr, TraceJVMTI, NULL,                                          \
1265           "Trace flags for JVMTI functions and events")                     \
1266                                                                             \
1267   /* This option can change an EMCP method into an obsolete method. */      \
1268   /* This can affect tests that except specific methods to be EMCP. */      \
1269   /* This option should be used with caution. */                            \
1270   product(bool, StressLdcRewrite, false,                                    \
1271           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1272                                                                             \
1273   product(intx, TraceRedefineClasses, 0,                                    \
1274           "Trace level for JVMTI RedefineClasses")                          \
1275                                                                             \
1276   develop(bool, StressMethodComparator, false,                              \
1277           "Run the MethodComparator on all loaded methods")                 \
1278                                                                             \
1279   /* change to false by default sometime after Mustang */                   \
1280   product(bool, VerifyMergedCPBytecodes, true,                              \
1281           "Verify bytecodes after RedefineClasses constant pool merging")   \
1282                                                                             \
1283   develop(bool, TraceJNIHandleAllocation, false,                            \
1284           "Trace allocation/deallocation of JNI handle blocks")             \
1285                                                                             \
1286   develop(bool, TraceThreadEvents, false,                                   \
1287           "Trace all thread events")                                        \
1288                                                                             \
1289   develop(bool, TraceBytecodes, false,                                      \
1290           "Trace bytecode execution")                                       \
1291                                                                             \
1292   develop(bool, TraceClassInitialization, false,                            \
1293           "Trace class initialization")                                     \
1294                                                                             \
1295   develop(bool, TraceExceptions, false,                                     \
1296           "Trace exceptions")                                               \
1297                                                                             \
1298   develop(bool, TraceICs, false,                                            \
1299           "Trace inline cache changes")                                     \
1300                                                                             \
1301   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1302           "Trace method invocation counter overflow")                       \
1303                                                                             \
1304   develop(bool, TraceInlineCacheClearing, false,                            \
1305           "Trace clearing of inline caches in nmethods")                    \
1306                                                                             \
1307   develop(bool, TraceDependencies, false,                                   \
1308           "Trace dependencies")                                             \
1309                                                                             \
1310   develop(bool, VerifyDependencies, trueInDebug,                            \
1311           "Exercise and verify the compilation dependency mechanism")       \
1312                                                                             \
1313   develop(bool, TraceNewOopMapGeneration, false,                            \
1314           "Trace OopMapGeneration")                                         \
1315                                                                             \
1316   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1317           "Trace OopMapGeneration: print detailed cell states")             \
1318                                                                             \
1319   develop(bool, TimeOopMap, false,                                          \
1320           "Time calls to GenerateOopMap::compute_map() in sum")             \
1321                                                                             \
1322   develop(bool, TimeOopMap2, false,                                         \
1323           "Time calls to GenerateOopMap::compute_map() individually")       \
1324                                                                             \
1325   develop(bool, TraceMonitorMismatch, false,                                \
1326           "Trace monitor matching failures during OopMapGeneration")        \
1327                                                                             \
1328   develop(bool, TraceOopMapRewrites, false,                                 \
1329           "Trace rewriting of method oops during oop map generation")       \
1330                                                                             \
1331   develop(bool, TraceSafepoint, false,                                      \
1332           "Trace safepoint operations")                                     \
1333                                                                             \
1334   develop(bool, TraceICBuffer, false,                                       \
1335           "Trace usage of IC buffer")                                       \
1336                                                                             \
1337   develop(bool, TraceCompiledIC, false,                                     \
1338           "Trace changes of compiled IC")                                   \
1339                                                                             \
1340   notproduct(bool, TraceZapDeadLocals, false,                               \
1341           "Trace zapping dead locals")                                      \
1342                                                                             \
1343   develop(bool, TraceStartupTime, false,                                    \
1344           "Trace setup time")                                               \
1345                                                                             \
1346   develop(bool, TraceProtectionDomainVerification, false,                   \
1347           "Trace protection domain verification")                           \
1348                                                                             \
1349   develop(bool, TraceClearedExceptions, false,                              \
1350           "Print when an exception is forcibly cleared")                    \
1351                                                                             \
1352   product(bool, TraceClassResolution, false,                                \
1353           "Trace all constant pool resolutions (for debugging)")            \
1354                                                                             \
1355   product(bool, TraceBiasedLocking, false,                                  \
1356           "Trace biased locking in JVM")                                    \
1357                                                                             \
1358   product(bool, TraceMonitorInflation, false,                               \
1359           "Trace monitor inflation in JVM")                                 \
1360                                                                             \
1361   /* gc */                                                                  \
1362                                                                             \
1363   product(bool, UseSerialGC, false,                                         \
1364           "Use the Serial garbage collector")                               \
1365                                                                             \
1366   product(bool, UseG1GC, false,                                             \
1367           "Use the Garbage-First garbage collector")                        \
1368                                                                             \
1369   product(bool, UseParallelGC, false,                                       \
1370           "Use the Parallel Scavenge garbage collector")                    \
1371                                                                             \
1372   product(bool, UseParallelOldGC, false,                                    \
1373           "Use the Parallel Old garbage collector")                         \
1374                                                                             \
1375   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1376           "How often should we maximally compact the heap (not allowing "   \
1377           "any dead space)")                                                \
1378                                                                             \
1379   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1380           "The collection count for the first maximum compaction")          \
1381                                                                             \
1382   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1383           "Use maximum compaction in the Parallel Old garbage collector "   \
1384           "for a system GC")                                                \
1385                                                                             \
1386   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1387           "The mean used by the parallel compact dead wood "                \
1388           "limiter (a number between 0-100)")                               \
1389                                                                             \
1390   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1391           "The standard deviation used by the parallel compact dead wood "  \
1392           "limiter (a number between 0-100)")                               \
1393                                                                             \
1394   product(uintx, ParallelGCThreads, 0,                                      \
1395           "Number of parallel threads parallel gc will use")                \
1396                                                                             \
1397   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1398           "Dynamically choose the number of parallel threads "              \
1399           "parallel gc will use")                                           \
1400                                                                             \
1401   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1402           "Force dynamic selection of the number of "                       \
1403           "parallel threads parallel gc will use to aid debugging")         \
1404                                                                             \
1405   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1406           "Size of heap (bytes) per GC thread used in calculating the "     \
1407           "number of GC threads")                                           \
1408                                                                             \
1409   product(bool, TraceDynamicGCThreads, false,                               \
1410           "Trace the dynamic GC thread usage")                              \
1411                                                                             \
1412   develop(bool, ParallelOldGCSplitALot, false,                              \
1413           "Provoke splitting (copying data from a young gen space to "      \
1414           "multiple destination spaces)")                                   \
1415                                                                             \
1416   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1417           "How often to provoke splitting a young gen space")               \
1418                                                                             \
1419   product(uintx, ConcGCThreads, 0,                                          \
1420           "Number of threads concurrent gc will use")                       \
1421                                                                             \
1422   product(uintx, YoungPLABSize, 4096,                                       \
1423           "Size of young gen promotion LAB's (in HeapWords)")               \
1424                                                                             \
1425   product(uintx, OldPLABSize, 1024,                                         \
1426           "Size of old gen promotion LAB's (in HeapWords)")                 \
1427                                                                             \
1428   product(uintx, GCTaskTimeStampEntries, 200,                               \
1429           "Number of time stamp entries per gc worker thread")              \
1430                                                                             \
1431   product(bool, AlwaysTenure, false,                                        \
1432           "Always tenure objects in eden (ParallelGC only)")                \
1433                                                                             \
1434   product(bool, NeverTenure, false,                                         \
1435           "Never tenure objects in eden, may tenure on overflow "           \
1436           "(ParallelGC only)")                                              \
1437                                                                             \
1438   product(bool, ScavengeBeforeFullGC, true,                                 \
1439           "Scavenge youngest generation before each full GC, "              \
1440           "used with UseParallelGC")                                        \
1441                                                                             \
1442   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1443           "Allow scavenges to occur when to-space contains objects")        \
1444                                                                             \
1445   product(bool, UseConcMarkSweepGC, false,                                  \
1446           "Use Concurrent Mark-Sweep GC in the old generation")             \
1447                                                                             \
1448   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1449           "A System.gc() request invokes a concurrent collection; "         \
1450           "(effective only when UseConcMarkSweepGC)")                       \
1451                                                                             \
1452   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1453           "A System.gc() request invokes a concurrent collection and "      \
1454           "also unloads classes during such a concurrent gc cycle "         \
1455           "(effective only when UseConcMarkSweepGC)")                       \
1456                                                                             \
1457   product(bool, GCLockerInvokesConcurrent, false,                           \
1458           "The exit of a JNI critical section necessitating a scavenge, "   \
1459           "also kicks off a background concurrent collection")              \
1460                                                                             \
1461   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1462           "How much the GC can expand the eden by while the GC locker "     \
1463           "is active (as a percentage)")                                    \
1464                                                                             \
1465   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1466           "Number of times to retry allocations when "                      \
1467           "blocked by the GC locker")                                       \
1468                                                                             \
1469   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1470           "Use adaptive free lists in the CMS generation")                  \
1471                                                                             \
1472   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1473           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1474                                                                             \
1475   develop(bool, RotateCMSCollectionTypes, false,                            \
1476           "Rotate the CMS collections among concurrent and STW")            \
1477                                                                             \
1478   product(bool, UseCMSBestFit, true,                                        \
1479           "Use CMS best fit allocation strategy")                           \
1480                                                                             \
1481   product(bool, UseCMSCollectionPassing, true,                              \
1482           "Use passing of collection from background to foreground")        \
1483                                                                             \
1484   product(bool, UseParNewGC, false,                                         \
1485           "Use parallel threads in the new generation")                     \
1486                                                                             \
1487   product(bool, ParallelGCVerbose, false,                                   \
1488           "Verbose output for parallel gc")                                 \
1489                                                                             \
1490   product(uintx, ParallelGCBufferWastePct, 10,                              \
1491           "Wasted fraction of parallel allocation buffer")                  \
1492                                                                             \
1493   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1494           "Retain parallel allocation buffers across scavenges; "           \
1495           "it is disabled because this currently conflicts with "           \
1496           "parallel card scanning under certain conditions.")               \
1497                                                                             \
1498   product(uintx, TargetPLABWastePct, 10,                                    \
1499           "Target wasted space in last buffer as percent of overall "       \
1500           "allocation")                                                     \
1501                                                                             \
1502   product(uintx, PLABWeight, 75,                                            \
1503           "Percentage (0-100) used to weigh the current sample when "       \
1504           "computing exponentially decaying average for ResizePLAB")        \
1505                                                                             \
1506   product(bool, ResizePLAB, true,                                           \
1507           "Dynamically resize (survivor space) promotion LAB's")            \
1508                                                                             \
1509   product(bool, PrintPLAB, false,                                           \
1510           "Print (survivor space) promotion LAB's sizing decisions")        \
1511                                                                             \
1512   product(intx, ParGCArrayScanChunk, 50,                                    \
1513           "Scan a subset of object array and push remainder, if array is "  \
1514           "bigger than this")                                               \
1515                                                                             \
1516   product(bool, ParGCUseLocalOverflow, false,                               \
1517           "Instead of a global overflow list, use local overflow stacks")   \
1518                                                                             \
1519   product(bool, ParGCTrimOverflow, true,                                    \
1520           "Eagerly trim the local overflow lists "                          \
1521           "(when ParGCUseLocalOverflow)")                                   \
1522                                                                             \
1523   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1524           "Simulate work queue overflow in ParNew")                         \
1525                                                                             \
1526   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1527           "An `interval' counter that determines how frequently "           \
1528           "we simulate overflow; a smaller number increases frequency")     \
1529                                                                             \
1530   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1531           "The desired number of objects to claim from the overflow list")  \
1532                                                                             \
1533   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1534           "The number of strides per worker thread that we divide up the "  \
1535           "card table scanning work into")                                  \
1536                                                                             \
1537   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1538           "The number of cards in each chunk of the parallel chunks used "  \
1539           "during card table scanning")                                     \
1540                                                                             \
1541   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1542           "Number of blocks to attempt to claim when refilling CMS LAB's "  \
1543           "for parallel GC")                                                \
1544                                                                             \
1545   product(uintx, OldPLABWeight, 50,                                         \
1546           "Percentage (0-100) used to weight the current sample when "      \
1547           "computing exponentially decaying average for resizing "          \
1548           "CMSParPromoteBlocksToClaim")                                     \
1549                                                                             \
1550   product(bool, ResizeOldPLAB, true,                                        \
1551           "Dynamically resize (old gen) promotion LAB's")                   \
1552                                                                             \
1553   product(bool, PrintOldPLAB, false,                                        \
1554           "Print (old gen) promotion LAB's sizing decisions")               \
1555                                                                             \
1556   product(uintx, CMSOldPLABMin, 16,                                         \
1557           "Minimum size of CMS gen promotion LAB caches per worker "        \
1558           "per block size")                                                 \
1559                                                                             \
1560   product(uintx, CMSOldPLABMax, 1024,                                       \
1561           "Maximum size of CMS gen promotion LAB caches per worker "        \
1562           "per block size")                                                 \
1563                                                                             \
1564   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1565           "Nominal number of refills of CMS gen promotion LAB cache "       \
1566           "per worker per block size")                                      \
1567                                                                             \
1568   product(bool, CMSOldPLABResizeQuicker, false,                             \
1569           "React on-the-fly during a scavenge to a sudden "                 \
1570           "change in block demand rate")                                    \
1571                                                                             \
1572   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1573           "The tolerance of the phase-change detector for on-the-fly "      \
1574           "PLAB resizing during a scavenge")                                \
1575                                                                             \
1576   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1577           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1578           "during a scavenge")                                              \
1579                                                                             \
1580   product(bool, AlwaysPreTouch, false,                                      \
1581           "Force all freshly committed pages to be pre-touched")            \
1582                                                                             \
1583   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1584           "The maximum size of young gen chosen by default per GC worker "  \
1585           "thread available")                                               \
1586                                                                             \
1587   product(bool, CMSIncrementalMode, false,                                  \
1588           "Whether CMS GC should operate in \"incremental\" mode")          \
1589                                                                             \
1590   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1591           "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
1592           "CMSIncrementalPacing is enabled, then this is just the initial " \
1593           "value.")                                                         \
1594                                                                             \
1595   product(bool, CMSIncrementalPacing, true,                                 \
1596           "Whether the CMS incremental mode duty cycle should be "          \
1597           "automatically adjusted")                                         \
1598                                                                             \
1599   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1600           "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
1601           "used when CMSIncrementalPacing is enabled")                      \
1602                                                                             \
1603   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1604           "Percentage (0-100) used to add conservatism when computing the " \
1605           "duty cycle")                                                     \
1606                                                                             \
1607   product(uintx, CMSIncrementalOffset, 0,                                   \
1608           "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1609           "is shifted to the right within the period between young GCs")    \
1610                                                                             \
1611   product(uintx, CMSExpAvgFactor, 50,                                       \
1612           "Percentage (0-100) used to weigh the current sample when "       \
1613           "computing exponential averages for CMS statistics")              \
1614                                                                             \
1615   product(uintx, CMS_FLSWeight, 75,                                         \
1616           "Percentage (0-100) used to weigh the current sample when "       \
1617           "computing exponentially decaying averages for CMS FLS "          \
1618           "statistics")                                                     \
1619                                                                             \
1620   product(uintx, CMS_FLSPadding, 1,                                         \
1621           "The multiple of deviation from mean to use for buffering "       \
1622           "against volatility in free list demand")                         \
1623                                                                             \
1624   product(uintx, FLSCoalescePolicy, 2,                                      \
1625           "CMS: aggressiveness level for coalescing, increasing "           \
1626           "from 0 to 4")                                                    \
1627                                                                             \
1628   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1629           "CMS: larger free blocks are always available for coalescing")    \
1630                                                                             \
1631   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1632           "CMS: the smaller the percentage the greater the coalescing "     \
1633           "force")                                                          \
1634                                                                             \
1635   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1636           "CMS: the factor by which to inflate estimated demand of small "  \
1637           "block sizes to prevent coalescing with an adjoining block")      \
1638                                                                             \
1639   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1640           "CMS: the factor by which to inflate estimated demand of large "  \
1641           "block sizes to prevent coalescing with an adjoining block")      \
1642                                                                             \
1643   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1644           "CMS: the factor by which to inflate estimated demand of small "  \
1645           "block sizes to prevent splitting to supply demand for smaller "  \
1646           "blocks")                                                         \
1647                                                                             \
1648   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1649           "CMS: the factor by which to inflate estimated demand of large "  \
1650           "block sizes to prevent splitting to supply demand for smaller "  \
1651           "blocks")                                                         \
1652                                                                             \
1653   product(bool, CMSExtrapolateSweep, false,                                 \
1654           "CMS: cushion for block demand during sweep")                     \
1655                                                                             \
1656   product(uintx, CMS_SweepWeight, 75,                                       \
1657           "Percentage (0-100) used to weight the current sample when "      \
1658           "computing exponentially decaying average for inter-sweep "       \
1659           "duration")                                                       \
1660                                                                             \
1661   product(uintx, CMS_SweepPadding, 1,                                       \
1662           "The multiple of deviation from mean to use for buffering "       \
1663           "against volatility in inter-sweep duration")                     \
1664                                                                             \
1665   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1666           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1667           "duration exceeds this threshold in milliseconds")                \
1668                                                                             \
1669   develop(bool, CMSTraceIncrementalMode, false,                             \
1670           "Trace CMS incremental mode")                                     \
1671                                                                             \
1672   develop(bool, CMSTraceIncrementalPacing, false,                           \
1673           "Trace CMS incremental mode pacing computation")                  \
1674                                                                             \
1675   develop(bool, CMSTraceThreadState, false,                                 \
1676           "Trace the CMS thread state (enable the trace_state() method)")   \
1677                                                                             \
1678   product(bool, CMSClassUnloadingEnabled, true,                             \
1679           "Whether class unloading enabled when using CMS GC")              \
1680                                                                             \
1681   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1682           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1683           "count for which classes may not be unloaded")                    \
1684                                                                             \
1685   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1686           "Compact when asked to collect CMS gen with "                     \
1687           "clear_all_soft_refs()")                                          \
1688                                                                             \
1689   product(bool, UseCMSCompactAtFullCollection, true,                        \
1690           "Use Mark-Sweep-Compact algorithm at full collections")           \
1691                                                                             \
1692   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1693           "Number of CMS full collection done before compaction if > 0")    \
1694                                                                             \
1695   develop(intx, CMSDictionaryChoice, 0,                                     \
1696           "Use BinaryTreeDictionary as default in the CMS generation")      \
1697                                                                             \
1698   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1699           "Replenish an indexed free list with this number of chunks")      \
1700                                                                             \
1701   product(bool, CMSReplenishIntermediate, true,                             \
1702           "Replenish all intermediate free-list caches")                    \
1703                                                                             \
1704   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1705           "When satisfying batched demand, split blocks from the "          \
1706           "IndexedFreeList whose size is a multiple of requested size")     \
1707                                                                             \
1708   product(bool, CMSLoopWarn, false,                                         \
1709           "Warn in case of excessive CMS looping")                          \
1710                                                                             \
1711   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1712           "Restore preserved marks early")                                  \
1713                                                                             \
1714   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1715           "Size of marking stack")                                          \
1716                                                                             \
1717   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1718           "Maximum size of marking stack")                                  \
1719                                                                             \
1720   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1721           "Simulate frequent marking stack / work queue overflow")          \
1722                                                                             \
1723   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1724           "An \"interval\" counter that determines how frequently "         \
1725           "to simulate overflow; a smaller number increases frequency")     \
1726                                                                             \
1727   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1728           "(Temporary, subject to experimentation) "                        \
1729           "Maximum number of abortable preclean iterations, if > 0")        \
1730                                                                             \
1731   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1732           "(Temporary, subject to experimentation) "                        \
1733           "Maximum time in abortable preclean (in milliseconds)")           \
1734                                                                             \
1735   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1736           "(Temporary, subject to experimentation) "                        \
1737           "Nominal minimum work per abortable preclean iteration")          \
1738                                                                             \
1739   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1740           "(Temporary, subject to experimentation) "                        \
1741           "Time that we sleep between iterations when not given "           \
1742           "enough work per iteration")                                      \
1743                                                                             \
1744   product(uintx, CMSRescanMultiple, 32,                                     \
1745           "Size (in cards) of CMS parallel rescan task")                    \
1746                                                                             \
1747   product(uintx, CMSConcMarkMultiple, 32,                                   \
1748           "Size (in cards) of CMS concurrent MT marking task")              \
1749                                                                             \
1750   product(bool, CMSAbortSemantics, false,                                   \
1751           "Whether abort-on-overflow semantics is implemented")             \
1752                                                                             \
1753   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1754           "Use the parallel initial mark.")                                 \
1755                                                                             \
1756   product(bool, CMSParallelRemarkEnabled, true,                             \
1757           "Whether parallel remark enabled (only if ParNewGC)")             \
1758                                                                             \
1759   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1760           "Whether parallel remark of survivor space "                      \
1761           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1762                                                                             \
1763   product(bool, CMSPLABRecordAlways, true,                                  \
1764           "Always record survivor space PLAB boundaries (effective only "   \
1765           "if CMSParallelSurvivorRemarkEnabled)")                           \
1766                                                                             \
1767   product(bool, CMSEdenChunksRecordAlways, true,                            \
1768           "Always record eden chunks used for the parallel initial mark "   \
1769           "or remark of eden")                                              \
1770                                                                             \
1771   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1772           "Print the eden and the survivor chunks used for the parallel "   \
1773           "initial mark or remark of the eden/survivor spaces")             \
1774                                                                             \
1775   product(bool, CMSConcurrentMTEnabled, true,                               \
1776           "Whether multi-threaded concurrent work enabled "                 \
1777           "(effective only if ParNewGC)")                                   \
1778                                                                             \
1779   product(bool, CMSPrecleaningEnabled, true,                                \
1780           "Whether concurrent precleaning enabled")                         \
1781                                                                             \
1782   product(uintx, CMSPrecleanIter, 3,                                        \
1783           "Maximum number of precleaning iteration passes")                 \
1784                                                                             \
1785   product(uintx, CMSPrecleanNumerator, 2,                                   \
1786           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1787           "ratio")                                                          \
1788                                                                             \
1789   product(uintx, CMSPrecleanDenominator, 3,                                 \
1790           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1791           "ratio")                                                          \
1792                                                                             \
1793   product(bool, CMSPrecleanRefLists1, true,                                 \
1794           "Preclean ref lists during (initial) preclean phase")             \
1795                                                                             \
1796   product(bool, CMSPrecleanRefLists2, false,                                \
1797           "Preclean ref lists during abortable preclean phase")             \
1798                                                                             \
1799   product(bool, CMSPrecleanSurvivors1, false,                               \
1800           "Preclean survivors during (initial) preclean phase")             \
1801                                                                             \
1802   product(bool, CMSPrecleanSurvivors2, true,                                \
1803           "Preclean survivors during abortable preclean phase")             \
1804                                                                             \
1805   product(uintx, CMSPrecleanThreshold, 1000,                                \
1806           "Do not iterate again if number of dirty cards is less than this")\
1807                                                                             \
1808   product(bool, CMSCleanOnEnter, true,                                      \
1809           "Clean-on-enter optimization for reducing number of dirty cards") \
1810                                                                             \
1811   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1812           "Choose variant (1,2) of verification following remark")          \
1813                                                                             \
1814   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1815           "If Eden size is below this, do not try to schedule remark")      \
1816                                                                             \
1817   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1818           "The Eden occupancy percentage (0-100) at which "                 \
1819           "to try and schedule remark pause")                               \
1820                                                                             \
1821   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1822           "Start sampling eden top at least before young gen "              \
1823           "occupancy reaches 1/<ratio> of the size at which "               \
1824           "we plan to schedule remark")                                     \
1825                                                                             \
1826   product(uintx, CMSSamplingGrain, 16*K,                                    \
1827           "The minimum distance between eden samples for CMS (see above)")  \
1828                                                                             \
1829   product(bool, CMSScavengeBeforeRemark, false,                             \
1830           "Attempt scavenge before the CMS remark step")                    \
1831                                                                             \
1832   develop(bool, CMSTraceSweeper, false,                                     \
1833           "Trace some actions of the CMS sweeper")                          \
1834                                                                             \
1835   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1836           "Don't drain below this size per parallel worker/thief")          \
1837                                                                             \
1838   manageable(intx, CMSWaitDuration, 2000,                                   \
1839           "Time in milliseconds that CMS thread waits for young GC")        \
1840                                                                             \
1841   develop(uintx, CMSCheckInterval, 1000,                                    \
1842           "Interval in milliseconds that CMS thread checks if it "          \
1843           "should start a collection cycle")                                \
1844                                                                             \
1845   product(bool, CMSYield, true,                                             \
1846           "Yield between steps of CMS")                                     \
1847                                                                             \
1848   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1849           "Bitmap operations should process at most this many bits "        \
1850           "between yields")                                                 \
1851                                                                             \
1852   product(bool, CMSDumpAtPromotionFailure, false,                           \
1853           "Dump useful information about the state of the CMS old "         \
1854           "generation upon a promotion failure")                            \
1855                                                                             \
1856   product(bool, CMSPrintChunksInDump, false,                                \
1857           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1858           "more detailed information about the free chunks")                \
1859                                                                             \
1860   product(bool, CMSPrintObjectsInDump, false,                               \
1861           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1862           "more detailed information about the allocated objects")          \
1863                                                                             \
1864   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1865           "Verify that all references across the FLS boundary "             \
1866           "are to valid objects")                                           \
1867                                                                             \
1868   diagnostic(bool, FLSVerifyLists, false,                                   \
1869           "Do lots of (expensive) FreeListSpace verification")              \
1870                                                                             \
1871   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1872           "Do lots of (expensive) FLS index table verification")            \
1873                                                                             \
1874   develop(bool, FLSVerifyDictionary, false,                                 \
1875           "Do lots of (expensive) FLS dictionary verification")             \
1876                                                                             \
1877   develop(bool, VerifyBlockOffsetArray, false,                              \
1878           "Do (expensive) block offset array verification")                 \
1879                                                                             \
1880   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1881           "Maintain _unallocated_block in BlockOffsetArray "                \
1882           "(currently applicable only to CMS collector)")                   \
1883                                                                             \
1884   develop(bool, TraceCMSState, false,                                       \
1885           "Trace the state of the CMS collection")                          \
1886                                                                             \
1887   product(intx, RefDiscoveryPolicy, 0,                                      \
1888           "Select type of reference discovery policy: "                     \
1889           "reference-based(0) or referent-based(1)")                        \
1890                                                                             \
1891   product(bool, ParallelRefProcEnabled, false,                              \
1892           "Enable parallel reference processing whenever possible")         \
1893                                                                             \
1894   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1895           "Enable balancing of reference processing queues")                \
1896                                                                             \
1897   product(uintx, CMSTriggerRatio, 80,                                       \
1898           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1899           "allocated before a CMS collection cycle commences")              \
1900                                                                             \
1901   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1902           "Percentage CMS generation occupancy at which to "                \
1903           "initiate CMS collection for bootstrapping collection stats")     \
1904                                                                             \
1905   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1906           "Percentage CMS generation occupancy to start a CMS collection "  \
1907           "cycle. A negative value means that CMSTriggerRatio is used")     \
1908                                                                             \
1909   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1910           "Percentage of the (entire) heap occupancy to start a "           \
1911           "concurrent GC cycle. It is used by GCs that trigger a "          \
1912           "concurrent GC cycle based on the occupancy of the entire heap, " \
1913           "not just one of the generations (e.g., G1). A value of 0 "       \
1914           "denotes 'do constant GC cycles'.")                               \
1915                                                                             \
1916   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1917           "Only use occupancy as a criterion for starting a CMS collection")\
1918                                                                             \
1919   product(uintx, CMSIsTooFullPercentage, 98,                                \
1920           "An absolute ceiling above which CMS will always consider the "   \
1921           "unloading of classes when class unloading is enabled")           \
1922                                                                             \
1923   develop(bool, CMSTestInFreeList, false,                                   \
1924           "Check if the coalesced range is already in the "                 \
1925           "free lists as claimed")                                          \
1926                                                                             \
1927   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1928           "Check that all the garbage collected was returned to the "       \
1929           "free lists")                                                     \
1930                                                                             \
1931   notproduct(bool, ScavengeALot, false,                                     \
1932           "Force scavenge at every Nth exit from the runtime system "       \
1933           "(N=ScavengeALotInterval)")                                       \
1934                                                                             \
1935   develop(bool, FullGCALot, false,                                          \
1936           "Force full gc at every Nth exit from the runtime system "        \
1937           "(N=FullGCALotInterval)")                                         \
1938                                                                             \
1939   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1940           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1941                                                                             \
1942   product(bool, PrintPromotionFailure, false,                               \
1943           "Print additional diagnostic information following "              \
1944           "promotion failure")                                              \
1945                                                                             \
1946   notproduct(bool, PromotionFailureALot, false,                             \
1947           "Use promotion failure handling on every youngest generation "    \
1948           "collection")                                                     \
1949                                                                             \
1950   develop(uintx, PromotionFailureALotCount, 1000,                           \
1951           "Number of promotion failures occurring at ParGCAllocBuffer "     \
1952           "refill attempts (ParNew) or promotion attempts "                 \
1953           "(other young collectors)")                                       \
1954                                                                             \
1955   develop(uintx, PromotionFailureALotInterval, 5,                           \
1956           "Total collections between promotion failures alot")              \
1957                                                                             \
1958   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1959           "Sleep time when sleep is used for yields")                       \
1960                                                                             \
1961   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1962           "Number of yields before a sleep is done during workstealing")    \
1963                                                                             \
1964   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1965           "Number of iterations in a spin loop between checks on "          \
1966           "time out of hard spin")                                          \
1967                                                                             \
1968   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1969           "Ratio of hard spins to calls to yield")                          \
1970                                                                             \
1971   develop(uintx, ObjArrayMarkingStride, 512,                                \
1972           "Number of object array elements to push onto the marking stack " \
1973           "before pushing a continuation entry")                            \
1974                                                                             \
1975   develop(bool, MetadataAllocationFailALot, false,                          \
1976           "Fail metadata allocations at intervals controlled by "           \
1977           "MetadataAllocationFailALotInterval")                             \
1978                                                                             \
1979   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1980           "Metadata allocation failure a lot interval")                     \
1981                                                                             \
1982   develop(bool, TraceMetadataChunkAllocation, false,                        \
1983           "Trace chunk metadata allocations")                               \
1984                                                                             \
1985   product(bool, TraceMetadataHumongousAllocation, false,                    \
1986           "Trace humongous metadata allocations")                           \
1987                                                                             \
1988   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1989           "Trace virtual space metadata allocations")                       \
1990                                                                             \
1991   notproduct(bool, ExecuteInternalVMTests, false,                           \
1992           "Enable execution of internal VM tests")                          \
1993                                                                             \
1994   notproduct(bool, VerboseInternalVMTests, false,                           \
1995           "Turn on logging for internal VM tests.")                         \
1996                                                                             \
1997   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1998                                                                             \
1999   product_pd(bool, ResizeTLAB,                                              \
2000           "Dynamically resize TLAB size for threads")                       \
2001                                                                             \
2002   product(bool, ZeroTLAB, false,                                            \
2003           "Zero out the newly created TLAB")                                \
2004                                                                             \
2005   product(bool, FastTLABRefill, true,                                       \
2006           "Use fast TLAB refill code")                                      \
2007                                                                             \
2008   product(bool, PrintTLAB, false,                                           \
2009           "Print various TLAB related information")                         \
2010                                                                             \
2011   product(bool, TLABStats, true,                                            \
2012           "Provide more detailed and expensive TLAB statistics "            \
2013           "(with PrintTLAB)")                                               \
2014                                                                             \
2015   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
2016           "Enable LowMemoryProtection"))                                    \
2017                                                                             \
2018   product_pd(bool, NeverActAsServerClassMachine,                            \
2019           "Never act like a server-class machine")                          \
2020                                                                             \
2021   product(bool, AlwaysActAsServerClassMachine, false,                       \
2022           "Always act like a server-class machine")                         \
2023                                                                             \
2024   product_pd(uint64_t, MaxRAM,                                              \
2025           "Real memory size (in bytes) used to set maximum heap size")      \
2026                                                                             \
2027   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2028           "Maximum ergonomically set heap size (in bytes); zero means use " \
2029           "MaxRAM / MaxRAMFraction")                                        \
2030                                                                             \
2031   product(uintx, MaxRAMFraction, 4,                                         \
2032           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2033           "size")                                                           \
2034                                                                             \
2035   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2036           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2037           "size; deprecated: to be renamed to MaxRAMFraction")              \
2038                                                                             \
2039   product(uintx, MinRAMFraction, 2,                                         \
2040           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2041           "size on systems with small physical memory size")                \
2042                                                                             \
2043   product(uintx, InitialRAMFraction, 64,                                    \
2044           "Fraction (1/n) of real memory used for initial heap size")       \
2045                                                                             \
2046   develop(uintx, MaxVirtMemFraction, 2,                                     \
2047           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2048           "determining maximum heap size")                                  \
2049                                                                             \
2050   product(bool, UseAutoGCSelectPolicy, false,                               \
2051           "Use automatic collection selection policy")                      \
2052                                                                             \
2053   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2054           "Automatic GC selection pause threshold in milliseconds")         \
2055                                                                             \
2056   product(bool, UseAdaptiveSizePolicy, true,                                \
2057           "Use adaptive generation sizing policies")                        \
2058                                                                             \
2059   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2060           "Use adaptive survivor sizing policies")                          \
2061                                                                             \
2062   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2063           "Use adaptive young-old sizing policies at minor collections")    \
2064                                                                             \
2065   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2066           "Use adaptive young-old sizing policies at major collections")    \
2067                                                                             \
2068   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2069           "Include statistics from System.gc() for adaptive size policy")   \
2070                                                                             \
2071   product(bool, UseAdaptiveGCBoundary, false,                               \
2072           "Allow young-old boundary to move")                               \
2073                                                                             \
2074   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2075           "Trace young-old boundary moves")                                 \
2076                                                                             \
2077   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2078           "Resize the virtual spaces of the young or old generations")      \
2079                                                                             \
2080   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2081           "Policy for changing generation size for throughput goals")       \
2082                                                                             \
2083   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2084           "Policy for changing generation size for pause goals")            \
2085                                                                             \
2086   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2087           "Adjust tenured generation to achieve a minor pause goal")        \
2088                                                                             \
2089   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2090           "Adjust young generation to achieve a major pause goal")          \
2091                                                                             \
2092   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2093           "Number of steps where heuristics is used before data is used")   \
2094                                                                             \
2095   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2096           "Number of collections before the adaptive sizing is started")    \
2097                                                                             \
2098   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2099           "Collection interval for printing information; zero means never") \
2100                                                                             \
2101   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2102           "Use adaptive minimum footprint as a goal")                       \
2103                                                                             \
2104   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2105           "Weight given to exponential resizing, between 0 and 100")        \
2106                                                                             \
2107   product(uintx, AdaptiveTimeWeight,       25,                              \
2108           "Weight given to time in adaptive policy, between 0 and 100")     \
2109                                                                             \
2110   product(uintx, PausePadding, 1,                                           \
2111           "How much buffer to keep for pause time")                         \
2112                                                                             \
2113   product(uintx, PromotedPadding, 3,                                        \
2114           "How much buffer to keep for promotion failure")                  \
2115                                                                             \
2116   product(uintx, SurvivorPadding, 3,                                        \
2117           "How much buffer to keep for survivor overflow")                  \
2118                                                                             \
2119   product(uintx, ThresholdTolerance, 10,                                    \
2120           "Allowed collection cost difference between generations")         \
2121                                                                             \
2122   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2123           "If collection costs are within margin, reduce both by full "     \
2124           "delta")                                                          \
2125                                                                             \
2126   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2127           "Adaptive size percentage change in young generation")            \
2128                                                                             \
2129   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2130           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2131                                                                             \
2132   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2133           "Decay factor to YoungedGenerationSizeSupplement")                \
2134                                                                             \
2135   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2136           "Adaptive size percentage change in tenured generation")          \
2137                                                                             \
2138   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2139           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2140                                                                             \
2141   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2142           "Decay factor to TenuredGenerationSizeIncrement")                 \
2143                                                                             \
2144   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2145           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2146           "or (G1 Only) the maximum GC time per MMU time slice")            \
2147                                                                             \
2148   product(uintx, GCPauseIntervalMillis, 0,                                  \
2149           "Time slice for MMU specification")                               \
2150                                                                             \
2151   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2152           "Adaptive size policy maximum GC minor pause time goal "          \
2153           "in millisecond")                                                 \
2154                                                                             \
2155   product(uintx, GCTimeRatio, 99,                                           \
2156           "Adaptive size policy application time to GC time ratio")         \
2157                                                                             \
2158   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2159           "Adaptive size scale down factor for shrinking")                  \
2160                                                                             \
2161   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2162           "Adaptive size decays the major cost for long major intervals")   \
2163                                                                             \
2164   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2165           "Time scale over which major costs decay")                        \
2166                                                                             \
2167   product(uintx, MinSurvivorRatio, 3,                                       \
2168           "Minimum ratio of young generation/survivor space size")          \
2169                                                                             \
2170   product(uintx, InitialSurvivorRatio, 8,                                   \
2171           "Initial ratio of young generation/survivor space size")          \
2172                                                                             \
2173   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2174           "Estimate of footprint other than Java Heap")                     \
2175                                                                             \
2176   product(bool, UseGCOverheadLimit, true,                                   \
2177           "Use policy to limit of proportion of time spent in GC "          \
2178           "before an OutOfMemory error is thrown")                          \
2179                                                                             \
2180   product(uintx, GCTimeLimit, 98,                                           \
2181           "Limit of the proportion of time spent in GC before "             \
2182           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2183                                                                             \
2184   product(uintx, GCHeapFreeLimit, 2,                                        \
2185           "Minimum percentage of free space after a full GC before an "     \
2186           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2187                                                                             \
2188   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2189           "Number of consecutive collections before gc time limit fires")   \
2190                                                                             \
2191   product(bool, PrintAdaptiveSizePolicy, false,                             \
2192           "Print information about AdaptiveSizePolicy")                     \
2193                                                                             \
2194   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2195           "How far ahead to prefetch destination area (<= 0 means off)")    \
2196                                                                             \
2197   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2198           "How far ahead to prefetch scan area (<= 0 means off)")           \
2199                                                                             \
2200   product(intx, PrefetchFieldsAhead, -1,                                    \
2201           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2202                                                                             \
2203   diagnostic(bool, VerifySilently, false,                                   \
2204           "Do not print the verification progress")                         \
2205                                                                             \
2206   diagnostic(bool, VerifyDuringStartup, false,                              \
2207           "Verify memory system before executing any Java code "            \
2208           "during VM initialization")                                       \
2209                                                                             \
2210   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2211           "Verify system before exiting")                                   \
2212                                                                             \
2213   diagnostic(bool, VerifyBeforeGC, false,                                   \
2214           "Verify memory system before GC")                                 \
2215                                                                             \
2216   diagnostic(bool, VerifyAfterGC, false,                                    \
2217           "Verify memory system after GC")                                  \
2218                                                                             \
2219   diagnostic(bool, VerifyDuringGC, false,                                   \
2220           "Verify memory system during GC (between phases)")                \
2221                                                                             \
2222   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2223           "Enable parallel memory system verification")                     \
2224                                                                             \
2225   diagnostic(bool, DeferInitialCardMark, false,                             \
2226           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2227           "may arise from new_pre_store_barrier")                           \
2228                                                                             \
2229   diagnostic(bool, VerifyRememberedSets, false,                             \
2230           "Verify GC remembered sets")                                      \
2231                                                                             \
2232   diagnostic(bool, VerifyObjectStartArray, true,                            \
2233           "Verify GC object start array if verify before/after")            \
2234                                                                             \
2235   product(bool, DisableExplicitGC, false,                                   \
2236           "Ignore calls to System.gc()")                                    \
2237                                                                             \
2238   notproduct(bool, CheckMemoryInitialization, false,                        \
2239           "Check memory initialization")                                    \
2240                                                                             \
2241   product(bool, CollectGen0First, false,                                    \
2242           "Collect youngest generation before each full GC")                \
2243                                                                             \
2244   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2245           "Bind CMS Thread to CPU if possible")                             \
2246                                                                             \
2247   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2248           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2249                                                                             \
2250   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2251           "Bind GCTaskThreads to CPUs if possible")                         \
2252                                                                             \
2253   product(bool, UseGCTaskAffinity, false,                                   \
2254           "Use worker affinity when asking for GCTasks")                    \
2255                                                                             \
2256   product(uintx, ProcessDistributionStride, 4,                              \
2257           "Stride through processors when distributing processes")          \
2258                                                                             \
2259   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2260           "Number of times the coordinator GC thread will sleep while "     \
2261           "yielding before giving up and resuming GC")                      \
2262                                                                             \
2263   product(uintx, CMSYieldSleepCount, 0,                                     \
2264           "Number of times a GC thread (minus the coordinator) "            \
2265           "will sleep while yielding before giving up and resuming GC")     \
2266                                                                             \
2267   /* gc tracing */                                                          \
2268   manageable(bool, PrintGC, false,                                          \
2269           "Print message at garbage collection")                            \
2270                                                                             \
2271   manageable(bool, PrintGCDetails, false,                                   \
2272           "Print more details at garbage collection")                       \
2273                                                                             \
2274   manageable(bool, PrintGCDateStamps, false,                                \
2275           "Print date stamps at garbage collection")                        \
2276                                                                             \
2277   manageable(bool, PrintGCTimeStamps, false,                                \
2278           "Print timestamps at garbage collection")                         \
2279                                                                             \
2280   product(bool, PrintGCTaskTimeStamps, false,                               \
2281           "Print timestamps for individual gc worker thread tasks")         \
2282                                                                             \
2283   develop(intx, ConcGCYieldTimeout, 0,                                      \
2284           "If non-zero, assert that GC threads yield within this "          \
2285           "number of milliseconds")                                         \
2286                                                                             \
2287   notproduct(bool, TraceMarkSweep, false,                                   \
2288           "Trace mark sweep")                                               \
2289                                                                             \
2290   product(bool, PrintReferenceGC, false,                                    \
2291           "Print times spent handling reference objects during GC "         \
2292           "(enabled only when PrintGCDetails)")                             \
2293                                                                             \
2294   develop(bool, TraceReferenceGC, false,                                    \
2295           "Trace handling of soft/weak/final/phantom references")           \
2296                                                                             \
2297   develop(bool, TraceFinalizerRegistration, false,                          \
2298           "Trace registration of final references")                         \
2299                                                                             \
2300   notproduct(bool, TraceScavenge, false,                                    \
2301           "Trace scavenge")                                                 \
2302                                                                             \
2303   product_rw(bool, TraceClassLoading, false,                                \
2304           "Trace all classes loaded")                                       \
2305                                                                             \
2306   product(bool, TraceClassLoadingPreorder, false,                           \
2307           "Trace all classes loaded in order referenced (not loaded)")      \
2308                                                                             \
2309   product_rw(bool, TraceClassUnloading, false,                              \
2310           "Trace unloading of classes")                                     \
2311                                                                             \
2312   product_rw(bool, TraceLoaderConstraints, false,                           \
2313           "Trace loader constraints")                                       \
2314                                                                             \
2315   develop(bool, TraceClassLoaderData, false,                                \
2316           "Trace class loader loader_data lifetime")                        \
2317                                                                             \
2318   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2319           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2320           "Initial size of the boot class loader data metaspace")           \
2321                                                                             \
2322   product(bool, TraceGen0Time, false,                                       \
2323           "Trace accumulated time for Gen 0 collection")                    \
2324                                                                             \
2325   product(bool, TraceGen1Time, false,                                       \
2326           "Trace accumulated time for Gen 1 collection")                    \
2327                                                                             \
2328   product(bool, PrintTenuringDistribution, false,                           \
2329           "Print tenuring age information")                                 \
2330                                                                             \
2331   product_rw(bool, PrintHeapAtGC, false,                                    \
2332           "Print heap layout before and after each GC")                     \
2333                                                                             \
2334   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2335           "Print extended information about the layout of the heap "        \
2336           "when -XX:+PrintHeapAtGC is set")                                 \
2337                                                                             \
2338   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2339           "Print heap layout in response to SIGBREAK")                      \
2340                                                                             \
2341   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2342           "Print a class histogram before any major stop-world GC")         \
2343                                                                             \
2344   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2345           "Print a class histogram after any major stop-world GC")          \
2346                                                                             \
2347   manageable(bool, PrintClassHistogram, false,                              \
2348           "Print a histogram of class instances")                           \
2349                                                                             \
2350   develop(bool, TraceWorkGang, false,                                       \
2351           "Trace activities of work gangs")                                 \
2352                                                                             \
2353   product(bool, TraceParallelOldGCTasks, false,                             \
2354           "Trace multithreaded GC activity")                                \
2355                                                                             \
2356   develop(bool, TraceBlockOffsetTable, false,                               \
2357           "Print BlockOffsetTable maps")                                    \
2358                                                                             \
2359   develop(bool, TraceCardTableModRefBS, false,                              \
2360           "Print CardTableModRefBS maps")                                   \
2361                                                                             \
2362   develop(bool, TraceGCTaskManager, false,                                  \
2363           "Trace actions of the GC task manager")                           \
2364                                                                             \
2365   develop(bool, TraceGCTaskQueue, false,                                    \
2366           "Trace actions of the GC task queues")                            \
2367                                                                             \
2368   diagnostic(bool, TraceGCTaskThread, false,                                \
2369           "Trace actions of the GC task threads")                           \
2370                                                                             \
2371   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2372           "Print the time taken by each phase in ParallelOldGC "            \
2373           "(PrintGCDetails must also be enabled)")                          \
2374                                                                             \
2375   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2376           "Trace marking phase in ParallelOldGC")                           \
2377                                                                             \
2378   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2379           "Trace summary phase in ParallelOldGC")                           \
2380                                                                             \
2381   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2382           "Trace compaction phase in ParallelOldGC")                        \
2383                                                                             \
2384   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2385           "Trace dense prefix computation for ParallelOldGC")               \
2386                                                                             \
2387   develop(bool, IgnoreLibthreadGPFault, false,                              \
2388           "Suppress workaround for libthread GP fault")                     \
2389                                                                             \
2390   product(bool, PrintJNIGCStalls, false,                                    \
2391           "Print diagnostic message when GC is stalled "                    \
2392           "by JNI critical section")                                        \
2393                                                                             \
2394   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2395           "The percentage of the used heap that the instances of a class "  \
2396           "must occupy for the class to generate a trace event")            \
2397                                                                             \
2398   /* GC log rotation setting */                                             \
2399                                                                             \
2400   product(bool, UseGCLogFileRotation, false,                                \
2401           "Rotate gclog files (for long running applications). It requires "\
2402           "-Xloggc:<filename>")                                             \
2403                                                                             \
2404   product(uintx, NumberOfGCLogFiles, 0,                                     \
2405           "Number of gclog files in rotation "                              \
2406           "(default: 0, no rotation)")                                      \
2407                                                                             \
2408   product(uintx, GCLogFileSize, 0,                                          \
2409           "GC log file size (default: 0 bytes, no rotation). "              \
2410           "It requires UseGCLogFileRotation")                               \
2411                                                                             \
2412   /* JVMTI heap profiling */                                                \
2413                                                                             \
2414   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2415           "Trace JVMTI object tagging calls")                               \
2416                                                                             \
2417   diagnostic(bool, VerifyBeforeIteration, false,                            \
2418           "Verify memory system before JVMTI iteration")                    \
2419                                                                             \
2420   /* compiler interface */                                                  \
2421                                                                             \
2422   develop(bool, CIPrintCompilerName, false,                                 \
2423           "when CIPrint is active, print the name of the active compiler")  \
2424                                                                             \
2425   develop(bool, CIPrintCompileQueue, false,                                 \
2426           "display the contents of the compile queue whenever a "           \
2427           "compilation is enqueued")                                        \
2428                                                                             \
2429   develop(bool, CIPrintRequests, false,                                     \
2430           "display every request for compilation")                          \
2431                                                                             \
2432   product(bool, CITime, false,                                              \
2433           "collect timing information for compilation")                     \
2434                                                                             \
2435   develop(bool, CITimeEach, false,                                          \
2436           "display timing information after each successful compilation")   \
2437                                                                             \
2438   develop(bool, CICountOSR, false,                                          \
2439           "use a separate counter when assigning ids to osr compilations")  \
2440                                                                             \
2441   develop(bool, CICompileNatives, true,                                     \
2442           "compile native methods if supported by the compiler")            \
2443                                                                             \
2444   develop_pd(bool, CICompileOSR,                                            \
2445           "compile on stack replacement methods if supported by the "       \
2446           "compiler")                                                       \
2447                                                                             \
2448   develop(bool, CIPrintMethodCodes, false,                                  \
2449           "print method bytecodes of the compiled code")                    \
2450                                                                             \
2451   develop(bool, CIPrintTypeFlow, false,                                     \
2452           "print the results of ciTypeFlow analysis")                       \
2453                                                                             \
2454   develop(bool, CITraceTypeFlow, false,                                     \
2455           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2456                                                                             \
2457   develop(intx, OSROnlyBCI, -1,                                             \
2458           "OSR only at this bci.  Negative values mean exclude that bci")   \
2459                                                                             \
2460   /* compiler */                                                            \
2461                                                                             \
2462   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2463           "Number of compiler threads to run")                              \
2464                                                                             \
2465   product(intx, CompilationPolicyChoice, 0,                                 \
2466           "which compilation policy (0/1)")                                 \
2467                                                                             \
2468   develop(bool, UseStackBanging, true,                                      \
2469           "use stack banging for stack overflow checks (required for "      \
2470           "proper StackOverflow handling; disable only to measure cost "    \
2471           "of stackbanging)")                                               \
2472                                                                             \
2473   develop(bool, UseStrictFP, true,                                          \
2474           "use strict fp if modifier strictfp is set")                      \
2475                                                                             \
2476   develop(bool, GenerateSynchronizationCode, true,                          \
2477           "generate locking/unlocking code for synchronized methods and "   \
2478           "monitors")                                                       \
2479                                                                             \
2480   develop(bool, GenerateCompilerNullChecks, true,                           \
2481           "Generate explicit null checks for loads/stores/calls")           \
2482                                                                             \
2483   develop(bool, GenerateRangeChecks, true,                                  \
2484           "Generate range checks for array accesses")                       \
2485                                                                             \
2486   develop_pd(bool, ImplicitNullChecks,                                      \
2487           "Generate code for implicit null checks")                         \
2488                                                                             \
2489   product(bool, PrintSafepointStatistics, false,                            \
2490           "Print statistics about safepoint synchronization")               \
2491                                                                             \
2492   product(intx, PrintSafepointStatisticsCount, 300,                         \
2493           "Total number of safepoint statistics collected "                 \
2494           "before printing them out")                                       \
2495                                                                             \
2496   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2497           "Print safepoint statistics only when safepoint takes "           \
2498           "more than PrintSafepointSatisticsTimeout in millis")             \
2499                                                                             \
2500   product(bool, TraceSafepointCleanupTime, false,                           \
2501           "Print the break down of clean up tasks performed during "        \
2502           "safepoint")                                                      \
2503                                                                             \
2504   product(bool, Inline, true,                                               \
2505           "Enable inlining")                                                \
2506                                                                             \
2507   product(bool, ClipInlining, true,                                         \
2508           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2509                                                                             \
2510   develop(bool, UseCHA, true,                                               \
2511           "Enable CHA")                                                     \
2512                                                                             \
2513   product(bool, UseTypeProfile, true,                                       \
2514           "Check interpreter profile for historically monomorphic calls")   \
2515                                                                             \
2516   notproduct(bool, TimeCompiler, false,                                     \
2517           "Time the compiler")                                              \
2518                                                                             \
2519   diagnostic(bool, PrintInlining, false,                                    \
2520           "Print inlining optimizations")                                   \
2521                                                                             \
2522   product(bool, UsePopCountInstruction, false,                              \
2523           "Use population count instruction")                               \
2524                                                                             \
2525   develop(bool, EagerInitialization, false,                                 \
2526           "Eagerly initialize classes if possible")                         \
2527                                                                             \
2528   develop(bool, TraceMethodReplacement, false,                              \
2529           "Print when methods are replaced do to recompilation")            \
2530                                                                             \
2531   develop(bool, PrintMethodFlushing, false,                                 \
2532           "Print the nmethods being flushed")                               \
2533                                                                             \
2534   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2535           "print statistics about method flushing")                         \
2536                                                                             \
2537   develop(bool, UseRelocIndex, false,                                       \
2538           "Use an index to speed random access to relocations")             \
2539                                                                             \
2540   develop(bool, StressCodeBuffers, false,                                   \
2541           "Exercise code buffer expansion and other rare state changes")    \
2542                                                                             \
2543   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2544           "Generate extra debugging information for non-safepoints in "     \
2545           "nmethods")                                                       \
2546                                                                             \
2547   product(bool, PrintVMOptions, false,                                      \
2548           "Print flags that appeared on the command line")                  \
2549                                                                             \
2550   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2551           "Ignore unrecognized VM options")                                 \
2552                                                                             \
2553   product(bool, PrintCommandLineFlags, false,                               \
2554           "Print flags specified on command line or set by ergonomics")     \
2555                                                                             \
2556   product(bool, PrintFlagsInitial, false,                                   \
2557           "Print all VM flags before argument processing and exit VM")      \
2558                                                                             \
2559   product(bool, PrintFlagsFinal, false,                                     \
2560           "Print all VM flags after argument and ergonomic processing")     \
2561                                                                             \
2562   notproduct(bool, PrintFlagsWithComments, false,                           \
2563           "Print all VM flags with default values and descriptions and "    \
2564           "exit")                                                           \
2565                                                                             \
2566   diagnostic(bool, SerializeVMOutput, true,                                 \
2567           "Use a mutex to serialize output to tty and LogFile")             \
2568                                                                             \
2569   diagnostic(bool, DisplayVMOutput, true,                                   \
2570           "Display all VM output on the tty, independently of LogVMOutput") \
2571                                                                             \
2572   diagnostic(bool, LogVMOutput, false,                                      \
2573           "Save VM output to LogFile")                                      \
2574                                                                             \
2575   diagnostic(ccstr, LogFile, NULL,                                          \
2576           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2577           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2578                                                                             \
2579   product(ccstr, ErrorFile, NULL,                                           \
2580           "If an error occurs, save the error data to this file "           \
2581           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2582                                                                             \
2583   product(bool, DisplayVMOutputToStderr, false,                             \
2584           "If DisplayVMOutput is true, display all VM output to stderr")    \
2585                                                                             \
2586   product(bool, DisplayVMOutputToStdout, false,                             \
2587           "If DisplayVMOutput is true, display all VM output to stdout")    \
2588                                                                             \
2589   product(bool, UseHeavyMonitors, false,                                    \
2590           "use heavyweight instead of lightweight Java monitors")           \
2591                                                                             \
2592   product(bool, PrintStringTableStatistics, false,                          \
2593           "print statistics about the StringTable and SymbolTable")         \
2594                                                                             \
2595   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2596           "verify StringTable contents at exit")                            \
2597                                                                             \
2598   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2599           "print histogram of the symbol table")                            \
2600                                                                             \
2601   notproduct(bool, ExitVMOnVerifyError, false,                              \
2602           "standard exit from VM if bytecode verify error "                 \
2603           "(only in debug mode)")                                           \
2604                                                                             \
2605   notproduct(ccstr, AbortVMOnException, NULL,                               \
2606           "Call fatal if this exception is thrown.  Example: "              \
2607           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2608                                                                             \
2609   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2610           "Call fatal if the exception pointed by AbortVMOnException "      \
2611           "has this message")                                               \
2612                                                                             \
2613   develop(bool, DebugVtables, false,                                        \
2614           "add debugging code to vtable dispatch")                          \
2615                                                                             \
2616   develop(bool, PrintVtables, false,                                        \
2617           "print vtables when printing klass")                              \
2618                                                                             \
2619   notproduct(bool, PrintVtableStats, false,                                 \
2620           "print vtables stats at end of run")                              \
2621                                                                             \
2622   develop(bool, TraceCreateZombies, false,                                  \
2623           "trace creation of zombie nmethods")                              \
2624                                                                             \
2625   notproduct(bool, IgnoreLockingAssertions, false,                          \
2626           "disable locking assertions (for speed)")                         \
2627                                                                             \
2628   product(bool, RangeCheckElimination, true,                                \
2629           "Eliminate range checks")                                         \
2630                                                                             \
2631   develop_pd(bool, UncommonNullCast,                                        \
2632           "track occurrences of null in casts; adjust compiler tactics")    \
2633                                                                             \
2634   develop(bool, TypeProfileCasts,  true,                                    \
2635           "treat casts like calls for purposes of type profiling")          \
2636                                                                             \
2637   develop(bool, DelayCompilationDuringStartup, true,                        \
2638           "Delay invoking the compiler until main application class is "    \
2639           "loaded")                                                         \
2640                                                                             \
2641   develop(bool, CompileTheWorld, false,                                     \
2642           "Compile all methods in all classes in bootstrap class path "     \
2643           "(stress test)")                                                  \
2644                                                                             \
2645   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2646           "Preload all classes used by a class before start loading")       \
2647                                                                             \
2648   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2649           "Force a safepoint every n compiles so sweeper can keep up")      \
2650                                                                             \
2651   develop(bool, FillDelaySlots, true,                                       \
2652           "Fill delay slots (on SPARC only)")                               \
2653                                                                             \
2654   develop(bool, TimeLivenessAnalysis, false,                                \
2655           "Time computation of bytecode liveness analysis")                 \
2656                                                                             \
2657   develop(bool, TraceLivenessGen, false,                                    \
2658           "Trace the generation of liveness analysis information")          \
2659                                                                             \
2660   notproduct(bool, TraceLivenessQuery, false,                               \
2661           "Trace queries of liveness analysis information")                 \
2662                                                                             \
2663   notproduct(bool, CollectIndexSetStatistics, false,                        \
2664           "Collect information about IndexSets")                            \
2665                                                                             \
2666   develop(bool, UseLoopSafepoints, true,                                    \
2667           "Generate Safepoint nodes in every loop")                         \
2668                                                                             \
2669   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2670           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2671           "Inline allocations larger than this in doublewords must go slow")\
2672                                                                             \
2673   product(bool, AggressiveOpts, false,                                      \
2674           "Enable aggressive optimizations - see arguments.cpp")            \
2675                                                                             \
2676   product_pd(uintx, TypeProfileLevel,                                       \
2677           "=XYZ, with Z: Type profiling of arguments at call; "             \
2678                      "Y: Type profiling of return value at call; "          \
2679                      "X: Type profiling of parameters to methods; "         \
2680           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2681                                                                             \
2682   product(intx, TypeProfileArgsLimit,     2,                                \
2683           "max number of call arguments to consider for type profiling")    \
2684                                                                             \
2685   product(intx, TypeProfileParmsLimit,    2,                                \
2686           "max number of incoming parameters to consider for type profiling"\
2687           ", -1 for all")                                                   \
2688                                                                             \
2689   /* statistics */                                                          \
2690   develop(bool, CountCompiledCalls, false,                                  \
2691           "Count method invocations")                                       \
2692                                                                             \
2693   notproduct(bool, CountRuntimeCalls, false,                                \
2694           "Count VM runtime calls")                                         \
2695                                                                             \
2696   develop(bool, CountJNICalls, false,                                       \
2697           "Count jni method invocations")                                   \
2698                                                                             \
2699   notproduct(bool, CountJVMCalls, false,                                    \
2700           "Count jvm method invocations")                                   \
2701                                                                             \
2702   notproduct(bool, CountRemovableExceptions, false,                         \
2703           "Count exceptions that could be replaced by branches due to "     \
2704           "inlining")                                                       \
2705                                                                             \
2706   notproduct(bool, ICMissHistogram, false,                                  \
2707           "Produce histogram of IC misses")                                 \
2708                                                                             \
2709   notproduct(bool, PrintClassStatistics, false,                             \
2710           "Print class statistics at end of run")                           \
2711                                                                             \
2712   notproduct(bool, PrintMethodStatistics, false,                            \
2713           "Print method statistics at end of run")                          \
2714                                                                             \
2715   /* interpreter */                                                         \
2716   develop(bool, ClearInterpreterLocals, false,                              \
2717           "Always clear local variables of interpreter activations upon "   \
2718           "entry")                                                          \
2719                                                                             \
2720   product_pd(bool, RewriteBytecodes,                                        \
2721           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2722                                                                             \
2723   product_pd(bool, RewriteFrequentPairs,                                    \
2724           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2725                                                                             \
2726   diagnostic(bool, PrintInterpreter, false,                                 \
2727           "Print the generated interpreter code")                           \
2728                                                                             \
2729   product(bool, UseInterpreter, true,                                       \
2730           "Use interpreter for non-compiled methods")                       \
2731                                                                             \
2732   develop(bool, UseFastSignatureHandlers, true,                             \
2733           "Use fast signature handlers for native calls")                   \
2734                                                                             \
2735   product(bool, UseLoopCounter, true,                                       \
2736           "Increment invocation counter on backward branch")                \
2737                                                                             \
2738   product(bool, UseFastEmptyMethods, true,                                  \
2739           "Use fast method entry code for empty methods")                   \
2740                                                                             \
2741   product(bool, UseFastAccessorMethods, true,                               \
2742           "Use fast method entry code for accessor methods")                \
2743                                                                             \
2744   product_pd(bool, UseOnStackReplacement,                                   \
2745           "Use on stack replacement, calls runtime if invoc. counter "      \
2746           "overflows in loop")                                              \
2747                                                                             \
2748   notproduct(bool, TraceOnStackReplacement, false,                          \
2749           "Trace on stack replacement")                                     \
2750                                                                             \
2751   product_pd(bool, PreferInterpreterNativeStubs,                            \
2752           "Use always interpreter stubs for native methods invoked via "    \
2753           "interpreter")                                                    \
2754                                                                             \
2755   develop(bool, CountBytecodes, false,                                      \
2756           "Count number of bytecodes executed")                             \
2757                                                                             \
2758   develop(bool, PrintBytecodeHistogram, false,                              \
2759           "Print histogram of the executed bytecodes")                      \
2760                                                                             \
2761   develop(bool, PrintBytecodePairHistogram, false,                          \
2762           "Print histogram of the executed bytecode pairs")                 \
2763                                                                             \
2764   diagnostic(bool, PrintSignatureHandlers, false,                           \
2765           "Print code generated for native method signature handlers")      \
2766                                                                             \
2767   develop(bool, VerifyOops, false,                                          \
2768           "Do plausibility checks for oops")                                \
2769                                                                             \
2770   develop(bool, CheckUnhandledOops, false,                                  \
2771           "Check for unhandled oops in VM code")                            \
2772                                                                             \
2773   develop(bool, VerifyJNIFields, trueInDebug,                               \
2774           "Verify jfieldIDs for instance fields")                           \
2775                                                                             \
2776   notproduct(bool, VerifyJNIEnvThread, false,                               \
2777           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2778           "from JNI")                                                       \
2779                                                                             \
2780   develop(bool, VerifyFPU, false,                                           \
2781           "Verify FPU state (check for NaN's, etc.)")                       \
2782                                                                             \
2783   develop(bool, VerifyThread, false,                                        \
2784           "Watch the thread register for corruption (SPARC only)")          \
2785                                                                             \
2786   develop(bool, VerifyActivationFrameSize, false,                           \
2787           "Verify that activation frame didn't become smaller than its "    \
2788           "minimal size")                                                   \
2789                                                                             \
2790   develop(bool, TraceFrequencyInlining, false,                              \
2791           "Trace frequency based inlining")                                 \
2792                                                                             \
2793   develop_pd(bool, InlineIntrinsics,                                        \
2794           "Inline intrinsics that can be statically resolved")              \
2795                                                                             \
2796   product_pd(bool, ProfileInterpreter,                                      \
2797           "Profile at the bytecode level during interpretation")            \
2798                                                                             \
2799   develop_pd(bool, ProfileTraps,                                            \
2800           "Profile deoptimization traps at the bytecode level")             \
2801                                                                             \
2802   product(intx, ProfileMaturityPercentage, 20,                              \
2803           "number of method invocations/branches (expressed as % of "       \
2804           "CompileThreshold) before using the method's profile")            \
2805                                                                             \
2806   develop(bool, PrintMethodData, false,                                     \
2807           "Print the results of +ProfileInterpreter at end of run")         \
2808                                                                             \
2809   develop(bool, VerifyDataPointer, trueInDebug,                             \
2810           "Verify the method data pointer during interpreter profiling")    \
2811                                                                             \
2812   develop(bool, VerifyCompiledCode, false,                                  \
2813           "Include miscellaneous runtime verifications in nmethod code; "   \
2814           "default off because it disturbs nmethod size heuristics")        \
2815                                                                             \
2816   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2817           "Manually make GC thread crash then dump java stack trace;  "     \
2818           "Test only")                                                      \
2819                                                                             \
2820   /* compilation */                                                         \
2821   product(bool, UseCompiler, true,                                          \
2822           "Use Just-In-Time compilation")                                   \
2823                                                                             \
2824   develop(bool, TraceCompilationPolicy, false,                              \
2825           "Trace compilation policy")                                       \
2826                                                                             \
2827   develop(bool, TimeCompilationPolicy, false,                               \
2828           "Time the compilation policy")                                    \
2829                                                                             \
2830   product(bool, UseCounterDecay, true,                                      \
2831           "Adjust recompilation counters")                                  \
2832                                                                             \
2833   develop(intx, CounterHalfLifeTime,    30,                                 \
2834           "Half-life time of invocation counters (in seconds)")             \
2835                                                                             \
2836   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2837           "The minimum interval (in milliseconds) between invocation of "   \
2838           "CounterDecay")                                                   \
2839                                                                             \
2840   product(bool, AlwaysCompileLoopMethods, false,                            \
2841           "When using recompilation, never interpret methods "              \
2842           "containing loops")                                               \
2843                                                                             \
2844   product(bool, DontCompileHugeMethods, true,                               \
2845           "Do not compile methods > HugeMethodLimit")                       \
2846                                                                             \
2847   /* Bytecode escape analysis estimation. */                                \
2848   product(bool, EstimateArgEscape, true,                                    \
2849           "Analyze bytecodes to estimate escape state of arguments")        \
2850                                                                             \
2851   product(intx, BCEATraceLevel, 0,                                          \
2852           "How much tracing to do of bytecode escape analysis estimates")   \
2853                                                                             \
2854   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2855           "Maximum number of nested calls that are analyzed by BC EA")      \
2856                                                                             \
2857   product(intx, MaxBCEAEstimateSize, 150,                                   \
2858           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2859                                                                             \
2860   product(intx,  AllocatePrefetchStyle, 1,                                  \
2861           "0 = no prefetch, "                                               \
2862           "1 = prefetch instructions for each allocation, "                 \
2863           "2 = use TLAB watermark to gate allocation prefetch, "            \
2864           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2865                                                                             \
2866   product(intx,  AllocatePrefetchDistance, -1,                              \
2867           "Distance to prefetch ahead of allocation pointer")               \
2868                                                                             \
2869   product(intx,  AllocatePrefetchLines, 3,                                  \
2870           "Number of lines to prefetch ahead of array allocation pointer")  \
2871                                                                             \
2872   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2873           "Number of lines to prefetch ahead of instance allocation "       \
2874           "pointer")                                                        \
2875                                                                             \
2876   product(intx,  AllocatePrefetchStepSize, 16,                              \
2877           "Step size in bytes of sequential prefetch instructions")         \
2878                                                                             \
2879   product(intx,  AllocatePrefetchInstr, 0,                                  \
2880           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2881                                                                             \
2882   /* deoptimization */                                                      \
2883   develop(bool, TraceDeoptimization, false,                                 \
2884           "Trace deoptimization")                                           \
2885                                                                             \
2886   develop(bool, DebugDeoptimization, false,                                 \
2887           "Tracing various information while debugging deoptimization")     \
2888                                                                             \
2889   product(intx, SelfDestructTimer, 0,                                       \
2890           "Will cause VM to terminate after a given time (in minutes) "     \
2891           "(0 means off)")                                                  \
2892                                                                             \
2893   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2894           "The maximum number of lines in the stack trace for Java "        \
2895           "exceptions (0 means all)")                                       \
2896                                                                             \
2897   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2898           "Guarantee a safepoint (at least) every so many milliseconds "    \
2899           "(0 means none)"))                                                \
2900                                                                             \
2901   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2902           "Guarantee a safepoint (at least) every so many milliseconds "    \
2903           "(0 means none)"))                                                \
2904                                                                             \
2905   product(intx, SafepointTimeoutDelay, 10000,                               \
2906           "Delay in milliseconds for option SafepointTimeout")              \
2907                                                                             \
2908   product(intx, NmethodSweepFraction, 16,                                   \
2909           "Number of invocations of sweeper to cover all nmethods")         \
2910                                                                             \
2911   product(intx, NmethodSweepCheckInterval, 5,                               \
2912           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2913                                                                             \
2914   product(intx, NmethodSweepActivity, 10,                                   \
2915           "Removes cold nmethods from code cache if > 0. Higher values "    \
2916           "result in more aggressive sweeping")                             \
2917                                                                             \
2918   notproduct(bool, LogSweeper, false,                                       \
2919           "Keep a ring buffer of sweeper activity")                         \
2920                                                                             \
2921   notproduct(intx, SweeperLogEntries, 1024,                                 \
2922           "Number of records in the ring buffer of sweeper activity")       \
2923                                                                             \
2924   notproduct(intx, MemProfilingInterval, 500,                               \
2925           "Time between each invocation of the MemProfiler")                \
2926                                                                             \
2927   develop(intx, MallocCatchPtr, -1,                                         \
2928           "Hit breakpoint when mallocing/freeing this pointer")             \
2929                                                                             \
2930   notproduct(intx, AssertRepeat, 1,                                         \
2931           "number of times to evaluate expression in assert "               \
2932           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2933                                                                             \
2934   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2935           "List of assertions (file:line) to muzzle")                       \
2936                                                                             \
2937   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2938           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2939           "is used")                                                        \
2940                                                                             \
2941   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2942           "Threshold for total handle allocation when "                     \
2943           "+TraceHandleAllocation is used")                                 \
2944                                                                             \
2945   develop(intx, StackPrintLimit, 100,                                       \
2946           "number of stack frames to print in VM-level stack dump")         \
2947                                                                             \
2948   notproduct(intx, MaxElementPrintSize, 256,                                \
2949           "maximum number of elements to print")                            \
2950                                                                             \
2951   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2952           "maximum number of subklasses to print when printing klass")      \
2953                                                                             \
2954   product(intx, MaxInlineLevel, 9,                                          \
2955           "maximum number of nested calls that are inlined")                \
2956                                                                             \
2957   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2958           "maximum number of nested recursive calls that are inlined")      \
2959                                                                             \
2960   develop(intx, MaxForceInlineLevel, 100,                                   \
2961           "maximum number of nested @ForceInline calls that are inlined")   \
2962                                                                             \
2963   product_pd(intx, InlineSmallCode,                                         \
2964           "Only inline already compiled methods if their code size is "     \
2965           "less than this")                                                 \
2966                                                                             \
2967   product(intx, MaxInlineSize, 35,                                          \
2968           "The maximum bytecode size of a method to be inlined")            \
2969                                                                             \
2970   product_pd(intx, FreqInlineSize,                                          \
2971           "The maximum bytecode size of a frequent method to be inlined")   \
2972                                                                             \
2973   product(intx, MaxTrivialSize, 6,                                          \
2974           "The maximum bytecode size of a trivial method to be inlined")    \
2975                                                                             \
2976   product(intx, MinInliningThreshold, 250,                                  \
2977           "The minimum invocation count a method needs to have to be "      \
2978           "inlined")                                                        \
2979                                                                             \
2980   develop(intx, MethodHistogramCutoff, 100,                                 \
2981           "The cutoff value for method invocation histogram (+CountCalls)") \
2982                                                                             \
2983   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2984           "Number of interpreted methods to show in profile")               \
2985                                                                             \
2986   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2987           "Number of compiled methods to show in profile")                  \
2988                                                                             \
2989   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2990           "Number of stub methods to show in profile")                      \
2991                                                                             \
2992   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2993           "Number of runtime stub nodes to show in profile")                \
2994                                                                             \
2995   product(intx, ProfileIntervalsTicks, 100,                                 \
2996           "Number of ticks between printing of interval profile "           \
2997           "(+ProfileIntervals)")                                            \
2998                                                                             \
2999   notproduct(intx, ScavengeALotInterval,     1,                             \
3000           "Interval between which scavenge will occur with +ScavengeALot")  \
3001                                                                             \
3002   notproduct(intx, FullGCALotInterval,     1,                               \
3003           "Interval between which full gc will occur with +FullGCALot")     \
3004                                                                             \
3005   notproduct(intx, FullGCALotStart,     0,                                  \
3006           "For which invocation to start FullGCAlot")                       \
3007                                                                             \
3008   notproduct(intx, FullGCALotDummies,  32*K,                                \
3009           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3010           "to move")                                                        \
3011                                                                             \
3012   develop(intx, DontYieldALotInterval,    10,                               \
3013           "Interval between which yields will be dropped (milliseconds)")   \
3014                                                                             \
3015   develop(intx, MinSleepInterval,     1,                                    \
3016           "Minimum sleep() interval (milliseconds) when "                   \
3017           "ConvertSleepToYield is off (used for Solaris)")                  \
3018                                                                             \
3019   develop(intx, ProfilerPCTickThreshold,    15,                             \
3020           "Number of ticks in a PC buckets to be a hotspot")                \
3021                                                                             \
3022   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3023           "Number of exits until DeoptimizeALot kicks in")                  \
3024                                                                             \
3025   notproduct(intx, ZombieALotInterval,     5,                               \
3026           "Number of exits until ZombieALot kicks in")                      \
3027                                                                             \
3028   diagnostic(intx, MallocVerifyInterval,     0,                             \
3029           "If non-zero, verify C heap after every N calls to "              \
3030           "malloc/realloc/free")                                            \
3031                                                                             \
3032   diagnostic(intx, MallocVerifyStart,     0,                                \
3033           "If non-zero, start verifying C heap after Nth call to "          \
3034           "malloc/realloc/free")                                            \
3035                                                                             \
3036   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3037           "If non-zero, maximum number of words that malloc/realloc can "   \
3038           "allocate (for testing only)")                                    \
3039                                                                             \
3040   product(intx, TypeProfileWidth,     2,                                    \
3041           "Number of receiver types to record in call/cast profile")        \
3042                                                                             \
3043   develop(intx, BciProfileWidth,      2,                                    \
3044           "Number of return bci's to record in ret profile")                \
3045                                                                             \
3046   product(intx, PerMethodRecompilationCutoff, 400,                          \
3047           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3048                                                                             \
3049   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3050           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3051                                                                             \
3052   product(intx, PerMethodTrapLimit,  100,                                   \
3053           "Limit on traps (of one kind) in a method (includes inlines)")    \
3054                                                                             \
3055   product(intx, PerBytecodeTrapLimit,  4,                                   \
3056           "Limit on traps (of one kind) at a particular BCI")               \
3057                                                                             \
3058   develop(intx, InlineFrequencyRatio,    20,                                \
3059           "Ratio of call site execution to caller method invocation")       \
3060                                                                             \
3061   develop_pd(intx, InlineFrequencyCount,                                    \
3062           "Count of call site execution necessary to trigger frequent "     \
3063           "inlining")                                                       \
3064                                                                             \
3065   develop(intx, InlineThrowCount,    50,                                    \
3066           "Force inlining of interpreted methods that throw this often")    \
3067                                                                             \
3068   develop(intx, InlineThrowMaxSize,   200,                                  \
3069           "Force inlining of throwing methods smaller than this")           \
3070                                                                             \
3071   develop(intx, ProfilerNodeSize,  1024,                                    \
3072           "Size in K to allocate for the Profile Nodes of each thread")     \
3073                                                                             \
3074   product_pd(intx, PreInflateSpin,                                          \
3075           "Number of times to spin wait before inflation")                  \
3076                                                                             \
3077   /* gc parameters */                                                       \
3078   product(uintx, InitialHeapSize, 0,                                        \
3079           "Initial heap size (in bytes); zero means use ergonomics")        \
3080                                                                             \
3081   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3082           "Maximum heap size (in bytes)")                                   \
3083                                                                             \
3084   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3085           "Initial tenured generation size (in bytes)")                     \
3086                                                                             \
3087   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3088           "Initial new generation size (in bytes)")                         \
3089                                                                             \
3090   product(uintx, MaxNewSize, max_uintx,                                     \
3091           "Maximum new generation size (in bytes), max_uintx means set "    \
3092           "ergonomically")                                                  \
3093                                                                             \
3094   product(uintx, PretenureSizeThreshold, 0,                                 \
3095           "Maximum size in bytes of objects allocated in DefNew "           \
3096           "generation; zero means no maximum")                              \
3097                                                                             \
3098   product(uintx, TLABSize, 0,                                               \
3099           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3100                                                                             \
3101   product(uintx, MinTLABSize, 2*K,                                          \
3102           "Minimum allowed TLAB size (in bytes)")                           \
3103                                                                             \
3104   product(uintx, TLABAllocationWeight, 35,                                  \
3105           "Allocation averaging weight")                                    \
3106                                                                             \
3107   product(uintx, TLABWasteTargetPercent, 1,                                 \
3108           "Percentage of Eden that can be wasted")                          \
3109                                                                             \
3110   product(uintx, TLABRefillWasteFraction,    64,                            \
3111           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3112                                                                             \
3113   product(uintx, TLABWasteIncrement,    4,                                  \
3114           "Increment allowed waste at slow allocation")                     \
3115                                                                             \
3116   product(uintx, SurvivorRatio, 8,                                          \
3117           "Ratio of eden/survivor space size")                              \
3118                                                                             \
3119   product(uintx, NewRatio, 2,                                               \
3120           "Ratio of old/new generation sizes")                              \
3121                                                                             \
3122   product_pd(uintx, NewSizeThreadIncrease,                                  \
3123           "Additional size added to desired new generation size per "       \
3124           "non-daemon thread (in bytes)")                                   \
3125                                                                             \
3126   product_pd(uintx, MetaspaceSize,                                          \
3127           "Initial size of Metaspaces (in bytes)")                          \
3128                                                                             \
3129   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3130           "Maximum size of Metaspaces (in bytes)")                          \
3131                                                                             \
3132   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3133           "Maximum size of class area in Metaspace when compressed "        \
3134           "class pointers are used")                                        \
3135                                                                             \
3136   product(uintx, MinHeapFreeRatio,    40,                                   \
3137           "The minimum percentage of heap free after GC to avoid expansion."\
3138           " For most GCs this applies to the old generation. In G1 it"      \
3139           " applies to the whole heap. Not supported by ParallelGC.")       \
3140                                                                             \
3141   product(uintx, MaxHeapFreeRatio,    70,                                   \
3142           "The maximum percentage of heap free after GC to avoid shrinking."\
3143           " For most GCs this applies to the old generation. In G1 it"      \
3144           " applies to the whole heap. Not supported by ParallelGC.")       \
3145                                                                             \
3146   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3147           "Number of milliseconds per MB of free space in the heap")        \
3148                                                                             \
3149   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3150           "The minimum change in heap space due to GC (in bytes)")          \
3151                                                                             \
3152   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3153           "The minimum expansion of Metaspace (in bytes)")                  \
3154                                                                             \
3155   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3156           "The minimum percentage of Metaspace free after GC to avoid "     \
3157           "expansion")                                                      \
3158                                                                             \
3159   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3160           "The maximum percentage of Metaspace free after GC to avoid "     \
3161           "shrinking")                                                      \
3162                                                                             \
3163   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3164           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3165                                                                             \
3166   product(uintx, QueuedAllocationWarningCount, 0,                           \
3167           "Number of times an allocation that queues behind a GC "          \
3168           "will retry before printing a warning")                           \
3169                                                                             \
3170   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3171           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3172                                                                             \
3173   diagnostic(intx, VerifyGCLevel,     0,                                    \
3174           "Generation level at which to start +VerifyBefore/AfterGC")       \
3175                                                                             \
3176   product(uintx, MaxTenuringThreshold,    15,                               \
3177           "Maximum value for tenuring threshold")                           \
3178                                                                             \
3179   product(uintx, InitialTenuringThreshold,    7,                            \
3180           "Initial value for tenuring threshold")                           \
3181                                                                             \
3182   product(uintx, TargetSurvivorRatio,    50,                                \
3183           "Desired percentage of survivor space used after scavenge")       \
3184                                                                             \
3185   product(uintx, MarkSweepDeadRatio,     5,                                 \
3186           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3187           "Serial mark sweep treats this as both the minimum and maximum "  \
3188           "value. "                                                         \
3189           "CMS uses this value only if it falls back to mark sweep. "       \
3190           "Par compact uses a variable scale based on the density of the "  \
3191           "generation and treats this as the maximum value when the heap "  \
3192           "is either completely full or completely empty.  Par compact "    \
3193           "also has a smaller default value; see arguments.cpp.")           \
3194                                                                             \
3195   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3196           "How often should we fully compact the heap (ignoring the dead "  \
3197           "space parameters)")                                              \
3198                                                                             \
3199   product(intx, PrintCMSStatistics, 0,                                      \
3200           "Statistics for CMS")                                             \
3201                                                                             \
3202   product(bool, PrintCMSInitiationStatistics, false,                        \
3203           "Statistics for initiating a CMS collection")                     \
3204                                                                             \
3205   product(intx, PrintFLSStatistics, 0,                                      \
3206           "Statistics for CMS' FreeListSpace")                              \
3207                                                                             \
3208   product(intx, PrintFLSCensus, 0,                                          \
3209           "Census for CMS' FreeListSpace")                                  \
3210                                                                             \
3211   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3212           "Delay between expansion and allocation (in milliseconds)")       \
3213                                                                             \
3214   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3215           "Delay in scheduling GC workers (in milliseconds)")               \
3216                                                                             \
3217   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3218           "(Unstable) Number of times to iterate in safepoint loop "        \
3219           "before blocking VM threads ")                                    \
3220                                                                             \
3221   product(intx, DeferPollingPageLoopCount,     -1,                          \
3222           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3223           "before changing safepoint polling page to RO ")                  \
3224                                                                             \
3225   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3226                                                                             \
3227   product(bool, PSChunkLargeArrays, true,                                   \
3228           "Process large arrays in chunks")                                 \
3229                                                                             \
3230   product(uintx, GCDrainStackTargetSize, 64,                                \
3231           "Number of entries we will try to leave on the stack "            \
3232           "during parallel gc")                                             \
3233                                                                             \
3234   /* stack parameters */                                                    \
3235   product_pd(intx, StackYellowPages,                                        \
3236           "Number of yellow zone (recoverable overflows) pages")            \
3237                                                                             \
3238   product_pd(intx, StackRedPages,                                           \
3239           "Number of red zone (unrecoverable overflows) pages")             \
3240                                                                             \
3241   product_pd(intx, StackShadowPages,                                        \
3242           "Number of shadow zone (for overflow checking) pages "            \
3243           "this should exceed the depth of the VM and native call stack")   \
3244                                                                             \
3245   product_pd(intx, ThreadStackSize,                                         \
3246           "Thread Stack Size (in Kbytes)")                                  \
3247                                                                             \
3248   product_pd(intx, VMThreadStackSize,                                       \
3249           "Non-Java Thread Stack Size (in Kbytes)")                         \
3250                                                                             \
3251   product_pd(intx, CompilerThreadStackSize,                                 \
3252           "Compiler Thread Stack Size (in Kbytes)")                         \
3253                                                                             \
3254   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3255           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3256                                                                             \
3257   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3258           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3259           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3260           "disable this feature")                                           \
3261                                                                             \
3262   /* code cache parameters */                                               \
3263   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3264           "Code cache segment size (in bytes) - smallest unit of "          \
3265           "allocation")                                                     \
3266                                                                             \
3267   develop_pd(intx, CodeEntryAlignment,                                      \
3268           "Code entry alignment for generated code (in bytes)")             \
3269                                                                             \
3270   product_pd(intx, OptoLoopAlignment,                                       \
3271           "Align inner loops to zero relative to this modulus")             \
3272                                                                             \
3273   product_pd(uintx, InitialCodeCacheSize,                                   \
3274           "Initial code cache size (in bytes)")                             \
3275                                                                             \
3276   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3277           "Minimum code cache size (in bytes) required to start VM.")       \
3278                                                                             \
3279   product_pd(uintx, ReservedCodeCacheSize,                                  \
3280           "Reserved code cache size (in bytes) - maximum code cache size")  \
3281                                                                             \
3282   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3283           "When less than X space left, we stop compiling")                 \
3284                                                                             \
3285   product_pd(uintx, CodeCacheExpansionSize,                                 \
3286           "Code cache expansion size (in bytes)")                           \
3287                                                                             \
3288   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3289           "Minimum number of segments in a code cache block")               \
3290                                                                             \
3291   notproduct(bool, ExitOnFullCodeCache, false,                              \
3292           "Exit the VM if we fill the code cache")                          \
3293                                                                             \
3294   product(bool, UseCodeCacheFlushing, true,                                 \
3295           "Remove cold/old nmethods from the code cache")                   \
3296                                                                             \
3297   /* interpreter debugging */                                               \
3298   develop(intx, BinarySwitchThreshold, 5,                                   \
3299           "Minimal number of lookupswitch entries for rewriting to binary " \
3300           "switch")                                                         \
3301                                                                             \
3302   develop(intx, StopInterpreterAt, 0,                                       \
3303           "Stop interpreter execution at specified bytecode number")        \
3304                                                                             \
3305   develop(intx, TraceBytecodesAt, 0,                                        \
3306           "Trace bytecodes starting with specified bytecode number")        \
3307                                                                             \
3308   /* compiler interface */                                                  \
3309   develop(intx, CIStart, 0,                                                 \
3310           "The id of the first compilation to permit")                      \
3311                                                                             \
3312   develop(intx, CIStop,    -1,                                              \
3313           "The id of the last compilation to permit")                       \
3314                                                                             \
3315   develop(intx, CIStartOSR,     0,                                          \
3316           "The id of the first osr compilation to permit "                  \
3317           "(CICountOSR must be on)")                                        \
3318                                                                             \
3319   develop(intx, CIStopOSR,    -1,                                           \
3320           "The id of the last osr compilation to permit "                   \
3321           "(CICountOSR must be on)")                                        \
3322                                                                             \
3323   develop(intx, CIBreakAtOSR,    -1,                                        \
3324           "The id of osr compilation to break at")                          \
3325                                                                             \
3326   develop(intx, CIBreakAt,    -1,                                           \
3327           "The id of compilation to break at")                              \
3328                                                                             \
3329   product(ccstrlist, CompileOnly, "",                                       \
3330           "List of methods (pkg/class.name) to restrict compilation to")    \
3331                                                                             \
3332   product(ccstr, CompileCommandFile, NULL,                                  \
3333           "Read compiler commands from this file [.hotspot_compiler]")      \
3334                                                                             \
3335   product(ccstrlist, CompileCommand, "",                                    \
3336           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3337                                                                             \
3338   develop(bool, ReplayCompiles, false,                                      \
3339           "Enable replay of compilations from ReplayDataFile")              \
3340                                                                             \
3341   product(ccstr, ReplayDataFile, NULL,                                      \
3342           "File containing compilation replay information"                  \
3343           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3344                                                                             \
3345   develop(intx, ReplaySuppressInitializers, 2,                              \
3346           "Control handling of class initialization during replay: "        \
3347           "0 - don't do anything special; "                                 \
3348           "1 - treat all class initializers as empty; "                     \
3349           "2 - treat class initializers for application classes as empty; " \
3350           "3 - allow all class initializers to run during bootstrap but "   \
3351           "    pretend they are empty after starting replay")               \
3352                                                                             \
3353   develop(bool, ReplayIgnoreInitErrors, false,                              \
3354           "Ignore exceptions thrown during initialization for replay")      \
3355                                                                             \
3356   product(bool, DumpReplayDataOnError, true,                                \
3357           "Record replay data for crashing compiler threads")               \
3358                                                                             \
3359   product(bool, CICompilerCountPerCPU, false,                               \
3360           "1 compiler thread for log(N CPUs)")                              \
3361                                                                             \
3362   develop(intx, CIFireOOMAt,    -1,                                         \
3363           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3364           "(non-negative value throws OOM after this many CI accesses "     \
3365           "in each compile)")                                               \
3366   notproduct(intx, CICrashAt, -1,                                           \
3367           "id of compilation to trigger assert in compiler thread for "     \
3368           "the purpose of testing, e.g. generation of replay data")         \
3369   notproduct(bool, CIObjectFactoryVerify, false,                            \
3370           "enable potentially expensive verification in ciObjectFactory")   \
3371                                                                             \
3372   /* Priorities */                                                          \
3373   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3374                                                                             \
3375   product(intx, ThreadPriorityPolicy, 0,                                    \
3376           "0 : Normal.                                                     "\
3377           "    VM chooses priorities that are appropriate for normal       "\
3378           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3379           "    to normal native priority. Java priorities below "           \
3380           "    NORM_PRIORITY map to lower native priority values. On       "\
3381           "    Windows applications are allowed to use higher native       "\
3382           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3383           "    not use the highest possible native priority,               "\
3384           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3385           "    system threads. On Linux thread priorities are ignored      "\
3386           "    because the OS does not support static priority in          "\
3387           "    SCHED_OTHER scheduling class which is the only choice for   "\
3388           "    non-root, non-realtime applications.                        "\
3389           "1 : Aggressive.                                                 "\
3390           "    Java thread priorities map over to the entire range of      "\
3391           "    native thread priorities. Higher Java thread priorities map "\
3392           "    to higher native thread priorities. This policy should be   "\
3393           "    used with care, as sometimes it can cause performance       "\
3394           "    degradation in the application and/or the entire system. On "\
3395           "    Linux this policy requires root privilege.")                 \
3396                                                                             \
3397   product(bool, ThreadPriorityVerbose, false,                               \
3398           "Print priority changes")                                         \
3399                                                                             \
3400   product(intx, DefaultThreadPriority, -1,                                  \
3401           "The native priority at which threads run if not elsewhere "      \
3402           "specified (-1 means no change)")                                 \
3403                                                                             \
3404   product(intx, CompilerThreadPriority, -1,                                 \
3405           "The native priority at which compiler threads should run "       \
3406           "(-1 means no change)")                                           \
3407                                                                             \
3408   product(intx, VMThreadPriority, -1,                                       \
3409           "The native priority at which the VM thread should run "          \
3410           "(-1 means no change)")                                           \
3411                                                                             \
3412   product(bool, CompilerThreadHintNoPreempt, true,                          \
3413           "(Solaris only) Give compiler threads an extra quanta")           \
3414                                                                             \
3415   product(bool, VMThreadHintNoPreempt, false,                               \
3416           "(Solaris only) Give VM thread an extra quanta")                  \
3417                                                                             \
3418   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3419           "Map Java priorities to OS priorities")                           \
3420                                                                             \
3421   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3422           "Map Java priorities to OS priorities")                           \
3423                                                                             \
3424   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3425           "Map Java priorities to OS priorities")                           \
3426                                                                             \
3427   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3428           "Map Java priorities to OS priorities")                           \
3429                                                                             \
3430   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3431           "Map Java priorities to OS priorities")                           \
3432                                                                             \
3433   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3434           "Map Java priorities to OS priorities")                           \
3435                                                                             \
3436   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3437           "Map Java priorities to OS priorities")                           \
3438                                                                             \
3439   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3440           "Map Java priorities to OS priorities")                           \
3441                                                                             \
3442   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3443           "Map Java priorities to OS priorities")                           \
3444                                                                             \
3445   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3446           "Map Java priorities to OS priorities")                           \
3447                                                                             \
3448   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3449           "Java thread priority 10 maps to critical scheduling priority")   \
3450                                                                             \
3451   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3452           "Compiler thread(s) run at critical scheduling priority")         \
3453                                                                             \
3454   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3455           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3456                                                                             \
3457   /* compiler debugging */                                                  \
3458   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3459           "First class to consider when using +CompileTheWorld")            \
3460                                                                             \
3461   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3462           "Last class to consider when using +CompileTheWorld")             \
3463                                                                             \
3464   develop(intx, NewCodeParameter,      0,                                   \
3465           "Testing Only: Create a dedicated integer parameter before "      \
3466           "putback")                                                        \
3467                                                                             \
3468   /* new oopmap storage allocation */                                       \
3469   develop(intx, MinOopMapAllocation,     8,                                 \
3470           "Minimum number of OopMap entries in an OopMapSet")               \
3471                                                                             \
3472   /* Background Compilation */                                              \
3473   develop(intx, LongCompileThreshold,     50,                               \
3474           "Used with +TraceLongCompiles")                                   \
3475                                                                             \
3476   product(intx, StarvationMonitorInterval,    200,                          \
3477           "Pause between each check (in milliseconds)")                     \
3478                                                                             \
3479   /* recompilation */                                                       \
3480   product_pd(intx, CompileThreshold,                                        \
3481           "number of interpreted method invocations before (re-)compiling") \
3482                                                                             \
3483   product_pd(intx, BackEdgeThreshold,                                       \
3484           "Interpreter Back edge threshold at which an OSR compilation is " \
3485           "invoked")                                                        \
3486                                                                             \
3487   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3488           "Interpreter (tier 0) invocation notification frequency")         \
3489                                                                             \
3490   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3491           "C1 without MDO (tier 2) invocation notification frequency")      \
3492                                                                             \
3493   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3494           "C1 with MDO profiling (tier 3) invocation notification "         \
3495           "frequency")                                                      \
3496                                                                             \
3497   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3498           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3499                                                                             \
3500   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3501           "Interpreter (tier 0) invocation notification frequency")         \
3502                                                                             \
3503   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3504           "C1 without MDO (tier 2) invocation notification frequency")      \
3505                                                                             \
3506   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3507           "C1 with MDO profiling (tier 3) invocation notification "         \
3508           "frequency")                                                      \
3509                                                                             \
3510   product(intx, Tier2CompileThreshold, 0,                                   \
3511           "threshold at which tier 2 compilation is invoked")               \
3512                                                                             \
3513   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3514           "Back edge threshold at which tier 2 compilation is invoked")     \
3515                                                                             \
3516   product(intx, Tier3InvocationThreshold, 200,                              \
3517           "Compile if number of method invocations crosses this "           \
3518           "threshold")                                                      \
3519                                                                             \
3520   product(intx, Tier3MinInvocationThreshold, 100,                           \
3521           "Minimum invocation to compile at tier 3")                        \
3522                                                                             \
3523   product(intx, Tier3CompileThreshold, 2000,                                \
3524           "Threshold at which tier 3 compilation is invoked (invocation "   \
3525           "minimum must be satisfied")                                      \
3526                                                                             \
3527   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3528           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3529                                                                             \
3530   product(intx, Tier4InvocationThreshold, 5000,                             \
3531           "Compile if number of method invocations crosses this "           \
3532           "threshold")                                                      \
3533                                                                             \
3534   product(intx, Tier4MinInvocationThreshold, 600,                           \
3535           "Minimum invocation to compile at tier 4")                        \
3536                                                                             \
3537   product(intx, Tier4CompileThreshold, 15000,                               \
3538           "Threshold at which tier 4 compilation is invoked (invocation "   \
3539           "minimum must be satisfied")                                      \
3540                                                                             \
3541   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3542           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3543                                                                             \
3544   product(intx, Tier3DelayOn, 5,                                            \
3545           "If C2 queue size grows over this amount per compiler thread "    \
3546           "stop compiling at tier 3 and start compiling at tier 2")         \
3547                                                                             \
3548   product(intx, Tier3DelayOff, 2,                                           \
3549           "If C2 queue size is less than this amount per compiler thread "  \
3550           "allow methods compiled at tier 2 transition to tier 3")          \
3551                                                                             \
3552   product(intx, Tier3LoadFeedback, 5,                                       \
3553           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3554           "reaches this amount per compiler thread")                        \
3555                                                                             \
3556   product(intx, Tier4LoadFeedback, 3,                                       \
3557           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3558           "reaches this amount per compiler thread")                        \
3559                                                                             \
3560   product(intx, TieredCompileTaskTimeout, 50,                               \
3561           "Kill compile task if method was not used within "                \
3562           "given timeout in milliseconds")                                  \
3563                                                                             \
3564   product(intx, TieredStopAtLevel, 4,                                       \
3565           "Stop at given compilation level")                                \
3566                                                                             \
3567   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3568           "Start profiling in interpreter if the counters exceed tier 3 "   \
3569           "thresholds by the specified percentage")                         \
3570                                                                             \
3571   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3572           "Increase the compile threshold for C1 compilation if the code "  \
3573           "cache is filled by the specified percentage")                    \
3574                                                                             \
3575   product(intx, TieredRateUpdateMinTime, 1,                                 \
3576           "Minimum rate sampling interval (in milliseconds)")               \
3577                                                                             \
3578   product(intx, TieredRateUpdateMaxTime, 25,                                \
3579           "Maximum rate sampling interval (in milliseconds)")               \
3580                                                                             \
3581   product_pd(bool, TieredCompilation,                                       \
3582           "Enable tiered compilation")                                      \
3583                                                                             \
3584   product(bool, PrintTieredEvents, false,                                   \
3585           "Print tiered events notifications")                              \
3586                                                                             \
3587   product_pd(intx, OnStackReplacePercentage,                                \
3588           "NON_TIERED number of method invocations/branches (expressed as " \
3589           "% of CompileThreshold) before (re-)compiling OSR code")          \
3590                                                                             \
3591   product(intx, InterpreterProfilePercentage, 33,                           \
3592           "NON_TIERED number of method invocations/branches (expressed as " \
3593           "% of CompileThreshold) before profiling in the interpreter")     \
3594                                                                             \
3595   develop(intx, MaxRecompilationSearchLength,    10,                        \
3596           "The maximum number of frames to inspect when searching for "     \
3597           "recompilee")                                                     \
3598                                                                             \
3599   develop(intx, MaxInterpretedSearchLength,     3,                          \
3600           "The maximum number of interpreted frames to skip when searching "\
3601           "for recompilee")                                                 \
3602                                                                             \
3603   develop(intx, DesiredMethodLimit,  8000,                                  \
3604           "The desired maximum method size (in bytecodes) after inlining")  \
3605                                                                             \
3606   develop(intx, HugeMethodLimit,  8000,                                     \
3607           "Don't compile methods larger than this if "                      \
3608           "+DontCompileHugeMethods")                                        \
3609                                                                             \
3610   /* New JDK 1.4 reflection implementation */                               \
3611                                                                             \
3612   develop(bool, UseNewReflection, true,                                     \
3613           "Temporary flag for transition to reflection based on dynamic "   \
3614           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3615           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3616           "changes were needed")                                            \
3617                                                                             \
3618   develop(bool, VerifyReflectionBytecodes, false,                           \
3619           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3620           "in situations like that described in 4486457 or for "            \
3621           "constructors generated for serialization, so can not be enabled "\
3622           "in product.")                                                    \
3623                                                                             \
3624   product(bool, ReflectionWrapResolutionErrors, true,                       \
3625           "Temporary flag for transition to AbstractMethodError wrapped "   \
3626           "in InvocationTargetException. See 6531596")                      \
3627                                                                             \
3628   develop(intx, FastSuperclassLimit, 8,                                     \
3629           "Depth of hardwired instanceof accelerator array")                \
3630                                                                             \
3631   /* Properties for Java libraries  */                                      \
3632                                                                             \
3633   product(uintx, MaxDirectMemorySize, 0,                                    \
3634           "Maximum total size of NIO direct-buffer allocations")            \
3635                                                                             \
3636   /* temporary developer defined flags  */                                  \
3637                                                                             \
3638   diagnostic(bool, UseNewCode, false,                                       \
3639           "Testing Only: Use the new version while testing")                \
3640                                                                             \
3641   diagnostic(bool, UseNewCode2, false,                                      \
3642           "Testing Only: Use the new version while testing")                \
3643                                                                             \
3644   diagnostic(bool, UseNewCode3, false,                                      \
3645           "Testing Only: Use the new version while testing")                \
3646                                                                             \
3647   /* flags for performance data collection */                               \
3648                                                                             \
3649   product(bool, UsePerfData, falseInEmbedded,                               \
3650           "Flag to disable jvmstat instrumentation for performance testing "\
3651           "and problem isolation purposes")                                 \
3652                                                                             \
3653   product(bool, PerfDataSaveToFile, false,                                  \
3654           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3655                                                                             \
3656   product(ccstr, PerfDataSaveFile, NULL,                                    \
3657           "Save PerfData memory to the specified absolute pathname. "       \
3658           "The string %p in the file name (if present) "                    \
3659           "will be replaced by pid")                                        \
3660                                                                             \
3661   product(intx, PerfDataSamplingInterval, 50,                               \
3662           "Data sampling interval (in milliseconds)")                       \
3663                                                                             \
3664   develop(bool, PerfTraceDataCreation, false,                               \
3665           "Trace creation of Performance Data Entries")                     \
3666                                                                             \
3667   develop(bool, PerfTraceMemOps, false,                                     \
3668           "Trace PerfMemory create/attach/detach calls")                    \
3669                                                                             \
3670   product(bool, PerfDisableSharedMem, false,                                \
3671           "Store performance data in standard memory")                      \
3672                                                                             \
3673   product(intx, PerfDataMemorySize, 32*K,                                   \
3674           "Size of performance data memory region. Will be rounded "        \
3675           "up to a multiple of the native os page size.")                   \
3676                                                                             \
3677   product(intx, PerfMaxStringConstLength, 1024,                             \
3678           "Maximum PerfStringConstant string length before truncation")     \
3679                                                                             \
3680   product(bool, PerfAllowAtExitRegistration, false,                         \
3681           "Allow registration of atexit() methods")                         \
3682                                                                             \
3683   product(bool, PerfBypassFileSystemCheck, false,                           \
3684           "Bypass Win32 file system criteria checks (Windows Only)")        \
3685                                                                             \
3686   product(intx, UnguardOnExecutionViolation, 0,                             \
3687           "Unguard page and retry on no-execute fault (Win32 only) "        \
3688           "0=off, 1=conservative, 2=aggressive")                            \
3689                                                                             \
3690   /* Serviceability Support */                                              \
3691                                                                             \
3692   product(bool, ManagementServer, false,                                    \
3693           "Create JMX Management Server")                                   \
3694                                                                             \
3695   product(bool, DisableAttachMechanism, false,                              \
3696           "Disable mechanism that allows tools to attach to this VM")       \
3697                                                                             \
3698   product(bool, StartAttachListener, false,                                 \
3699           "Always start Attach Listener at VM startup")                     \
3700                                                                             \
3701   manageable(bool, PrintConcurrentLocks, false,                             \
3702           "Print java.util.concurrent locks in thread dump")                \
3703                                                                             \
3704   product(bool, TransmitErrorReport, false,                                 \
3705           "Enable error report transmission on erroneous termination")      \
3706                                                                             \
3707   product(ccstr, ErrorReportServer, NULL,                                   \
3708           "Override built-in error report server address")                  \
3709                                                                             \
3710   /* Shared spaces */                                                       \
3711                                                                             \
3712   product(bool, UseSharedSpaces, true,                                      \
3713           "Use shared spaces for metadata")                                 \
3714                                                                             \
3715   product(bool, RequireSharedSpaces, false,                                 \
3716           "Require shared spaces for metadata")                             \
3717                                                                             \
3718   product(bool, DumpSharedSpaces, false,                                    \
3719           "Special mode: JVM reads a class list, loads classes, builds "    \
3720           "shared spaces, and dumps the shared spaces to a file to be "     \
3721           "used in future JVM runs")                                        \
3722                                                                             \
3723   product(bool, PrintSharedSpaces, false,                                   \
3724           "Print usage of shared spaces")                                   \
3725                                                                             \
3726   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3727           "Size of read-write space for metadata (in bytes)")               \
3728                                                                             \
3729   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3730           "Size of read-only space for metadata (in bytes)")                \
3731                                                                             \
3732   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3733           "Size of the shared miscellaneous data area (in bytes)")          \
3734                                                                             \
3735   product(uintx, SharedMiscCodeSize,    120*K,                              \
3736           "Size of the shared miscellaneous code area (in bytes)")          \
3737                                                                             \
3738   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3739           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3740           "Address to allocate shared memory region for class data")        \
3741                                                                             \
3742   diagnostic(bool, EnableInvokeDynamic, true,                               \
3743           "support JSR 292 (method handles, invokedynamic, "                \
3744           "anonymous classes")                                              \
3745                                                                             \
3746   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3747           "Print generated stub code for method handles")                   \
3748                                                                             \
3749   develop(bool, TraceMethodHandles, false,                                  \
3750           "trace internal method handle operations")                        \
3751                                                                             \
3752   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3753           "perform extra checks when constructing method handles")          \
3754                                                                             \
3755   diagnostic(bool, ShowHiddenFrames, false,                                 \
3756           "show method handle implementation frames (usually hidden)")      \
3757                                                                             \
3758   experimental(bool, TrustFinalNonStaticFields, false,                      \
3759           "trust final non-static declarations for constant folding")       \
3760                                                                             \
3761   experimental(bool, FoldStableValues, false,                               \
3762           "Private flag to control optimizations for stable variables")     \
3763                                                                             \
3764   develop(bool, TraceInvokeDynamic, false,                                  \
3765           "trace internal invoke dynamic operations")                       \
3766                                                                             \
3767   diagnostic(bool, PauseAtStartup,      false,                              \
3768           "Causes the VM to pause at startup time and wait for the pause "  \
3769           "file to be removed (default: ./vm.paused.<pid>)")                \
3770                                                                             \
3771   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3772           "The file to create and for whose removal to await when pausing " \
3773           "at startup. (default: ./vm.paused.<pid>)")                       \
3774                                                                             \
3775   diagnostic(bool, PauseAtExit, false,                                      \
3776           "Pause and wait for keypress on exit if a debugger is attached")  \
3777                                                                             \
3778   product(bool, ExtendedDTraceProbes,    false,                             \
3779           "Enable performance-impacting dtrace probes")                     \
3780                                                                             \
3781   product(bool, DTraceMethodProbes, false,                                  \
3782           "Enable dtrace probes for method-entry and method-exit")          \
3783                                                                             \
3784   product(bool, DTraceAllocProbes, false,                                   \
3785           "Enable dtrace probes for object allocation")                     \
3786                                                                             \
3787   product(bool, DTraceMonitorProbes, false,                                 \
3788           "Enable dtrace probes for monitor events")                        \
3789                                                                             \
3790   product(bool, RelaxAccessControlCheck, false,                             \
3791           "Relax the access control checks in the verifier")                \
3792                                                                             \
3793   diagnostic(bool, PrintDTraceDOF, false,                                   \
3794           "Print the DTrace DOF passed to the system for JSDT probes")      \
3795                                                                             \
3796   product(uintx, StringTableSize, defaultStringTableSize,                   \
3797           "Number of buckets in the interned String table")                 \
3798                                                                             \
3799   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3800           "Number of buckets in the JVM internal Symbol table")             \
3801                                                                             \
3802   develop(bool, TraceDefaultMethods, false,                                 \
3803           "Trace the default method processing steps")                      \
3804                                                                             \
3805   develop(bool, VerifyGenericSignatures, false,                             \
3806           "Abort VM on erroneous or inconsistent generic signatures")       \
3807                                                                             \
3808   product(bool, UseVMInterruptibleIO, false,                                \
3809           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3810           "EINTR for I/O operations results in OS_INTRPT. The default "     \
3811           "value of this flag is true for JDK 6 and earlier")               \
3812                                                                             \
3813   diagnostic(bool, WhiteBoxAPI, false,                                      \
3814           "Enable internal testing APIs")                                   \
3815                                                                             \
3816   product(bool, PrintGCCause, true,                                         \
3817           "Include GC cause in GC logging")                                 \
3818                                                                             \
3819   product(bool , AllowNonVirtualCalls, false,                               \
3820           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3821                                                                             \
3822   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3823           "Override the default location of the CDS archive file")          \
3824                                                                             \
3825   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3826           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3827           "Allocation less than this value will be allocated "              \
3828           "using malloc. Larger allocations will use mmap.")                \
3829                                                                             \
3830   product(bool, EnableTracing, false,                                       \
3831           "Enable event-based tracing")                                     \
3832                                                                             \
3833   product(bool, UseLockedTracing, false,                                    \
3834           "Use locked-tracing when doing event-based tracing")
3835 
3836 /*
3837  *  Macros for factoring of globals
3838  */
3839 
3840 // Interface macros
3841 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
3842 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
3843 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
3844 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3845 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
3846 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
3847 #ifdef PRODUCT
3848 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
3849 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
3850 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
3851 #else
3852 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
3853 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
3854 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
3855 #endif
3856 // Special LP64 flags, product only needed for now.
3857 #ifdef _LP64
3858 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3859 #else
3860 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3861 #endif // _LP64
3862 
3863 // Implementation macros
3864 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
3865 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
3866 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
3867 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3868 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
3869 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
3870 #ifdef PRODUCT
3871 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
3872 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
3873 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
3874 #else
3875 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
3876 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
3877 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
3878 #endif
3879 #ifdef _LP64
3880 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3881 #else
3882 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3883 #endif // _LP64
3884 
3885 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
3886 
3887 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3888 
3889 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3890 
3891 // Extensions
3892 
3893 #include "runtime/globals_ext.hpp"
3894 
3895 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP